C++ help thank you! Data file: Client program: Correct output: (What we need to
ID: 3777016 • Letter: C
Question
C++ help thank you!
Data file:
Client program:
Correct output:
(What we need to do)
you'll be making the following refinements to the class that you wrote in the last assignment. All the requirements from that class still apply. For example, all myStrings must always be stored in a dynamic array that is exactly the correct size to store the string.
Extraction Operator
Just like the >> operator that reads C-strings, your >> operator should skip any leading spaces and then read characters into the string up to the first whitespace character.
For reasons of convenience, we will impose a limit of 127 on the number of characters this function will read. This is so you can temporarily read into a non-dynamic array and then copy what you need into your data member, which will be a dynamic array. Note that this does not mean that all myStrings will always have a maximum of 127 characters. For example, you might get a myString with more than 127 characters by using the myString constructor or by concatenating two myStrings.
Hint: Don't try to read character by character in a loop. Use the extraction operator to do the reading of the input into a non-dynamic array, then use strcpy() to copy it into your data member. Make sure to allocate the correct amount of memory.
Hint: if you use the extraction operator as suggested above, you will not have to skip leading whitespace, because the extraction operator does that for you.
A read() function
The read() function will allow the client programmer to specify the delimiting character (the one to stop at instead of the first space). This will be a void function that will take two arguments, a stream and the delimiting character. It should not skip leading spaces. The limit of 127 characters imposed on the >> function above also applies to this function.
Hint: Don't try to read character by character in a loop. Use the in.getline() function to do the reading of the input into a non-dynamic array, then use strcpy() to copy it into your data member.
Concatenation Operator
Overload the + operator to do myString concatenation. The operator must be able to handle either myString objects or C-strings on either side of the operator. Be careful with the memory management here. You'll have to allocate enough memory to hold the new myString. I suggest using strcpy() to get the left operand into the result myString, and then strcat() to append the right operand. Both strcpy() and strcat() should be used as if they are void, even though they do have return values.
Combined Concatenation/Assignment Operator
Overload the shorthand += to combine concatenation and assignment. Only myStrings can be on the left-hand side of a += operation, but either myStrings or C-strings may appear on the right side. If you pay close attention to the += operator from the feetInches class, these may be the easiest points of the semester.
Add Documentation (Please also do this part)
Header File: In the case of a class, the header file should begin with a (typically) very large header comment. This comment should include a general description of the class (so a client programmer can tell right away whether she wants to use it), followed by a listing of all of the prototypes of public members, each with pre and post conditions. Note that this list of prototypes is still part of the comment. You will have to list the prototypes again in the code below this header comment! You are required to use pre/post conditions to document your public member functions. Do not include any comments regarding the implementation details in the header file! This very large comment will then be followed by the header file code (e.g. the class declaration), with no comments.
Implementation File: In the implementation file you should start with a class invariant. (I don't expect you to have prior knowledge of what a class invariant is. The description that follows should suffice.) The class invariant will include a description of the private data members and how they are used, as well as a statement of anything that you guarantee will always be true for class objects (for example: "fraction objects will always be stored in lowest terms"). Aside from the class invariant, the only comments you will need in your implementation file are comments on the implementation of complex functions, and comments on private functions (which do not get comments in the header file).
Comments in the header file will follow the following pattern.
Name your source code files mystring.h and mystring.cpp.
==============================================
Previous work and requirement:
See also client program and correct output.
Clint program
Correct output
Requirements:
Write a string class. To avoid conflicts with other similarly named classes, we will call our version myString. This object is designed to make working with sequences of characters a little more convenient and less error-prone than handling raw c-strings, (although it will be implemented as a c-string behind the scenes). The myString class will handle constructing strings, reading/printing, and accessing characters. In addition, the myString object will have the ability to make a full deep-copy of itself when copied.
Your class must have only one data member, a c-string implemented as a dynamic array. In particular, you must not use a data member to keep track of the size or length of the myString.
This is the first part of a two part assignment. In the next assignment you will be making some refinements to the class that you create in this assignment. For example, no documentation is required this week, but full documentation will be required next week.
Here is a list of the operations this class must support:
A length member function which returns the number of characters in the string. Use strlen().
Construction of a myString from a const c-string. You should copy the string data, not just store a pointer to an argument passed to the constructor. Constructing a myString with no arguments creates an empty myString object (i.e. ""). A myString object should be implemented efficiently (space-wise) which is to say you should not have a fixed-size buffer of chars, but instead allocate space for chars on an as-needed basis. Use strcpy().
Printing a myString to a stream using an overloaded << (insertion) operator, which should simply print out its characters. Use <<.
Your myString object should overload the square brackets [ ] operator to allow direct access to the individual characters of the string. This operation should range-check and assert if the index is out of bounds. You will write two versions of the [ ] operator, a const version that allows read access to the chars, and a non-const version that returns the client a reference to the char so they can change the value.
All six of the relational operators (<, <=, >, >=, ==, !=) should be supported. They should be able to compare myString objects to other myStrings as well as myStrings to c-strings. The ordering will be based on ASCII values. You can think of this as essentially alphabetical order; however, because of the way that ASCII values are defined, uppercase letters will always come before lowercase letters, and punctuation will make things even more complicated. Confused? You don't need to worry about any of this: just use the results of calling the strcmp() function. myStrings or c-strings should be able to appear on either side of the comparison operator.
Of course, you'll also need to include the four functions discussed in the lesson that are always required in classes that use dynamic memory. (These functions, excluding the default constructor, are otherwise known as the "big-three".)
You may use all of the c-string functionality provided by C++. This will include the strlen(), strcmp(), and strcpy() functions, along with the overloaded insertion operator for c-strings. These functions are all covered in detail in the text. When you use strcpy() treat it as a void function despite the fact that it has a return value. Do not use strncpy(), strncat(), or strncmp() since they are not implemented in all versions of C++. You may NOT use anything from the C++ string class!!
You must place your header file and implementation file in a namespace. Normally one would call a namespace something more likely to be unique, but for purposes of convenience we will call our namespace "cs_mystring".
myString.h
#ifndef myString_H
#define myString_H
#include <iostream>
#include <cstring>
using namespace std;
namespace cs_myString {
class myString {
public:
/*
Preconditon: Takes no parameter and return nothing.
Postcondition: Initialize data member-'desc' with memory of size 1 and
copy empty string to it
*/
myString();
/*
Preconditon: Takes one argument - pointer to char object 'inDesc' and
is kept const
Postcondition: object is created with size accordingly with specified
object pointer given at input
*/
myString(const char *inDesc);
/*
Preconditon: Takes one argument - reference to myString object 'right'
and is kept const
Postcondition: object is created with size accordingly with specified
object reference given at input
*/
myString(const myString& right);
/*
Preconditon: an myString object exist with valid length
Postcondition: myString object is destroyed
*/
~myString();
/*
Preconditon: Input argument contains address to myString object:-Right.
Postcondition: object is copied with size accordingly with specified
object reference given at input
*/
myString operator=(const myString& right);
/*
Preconditon: Input argument contains address to myString object:-Right.
Postcondition: returns pointer to this object which was created by
combination of concatenation and assignment operator
*/
myString operator+=(const myString& right);
/*
Preconditon: Input argument contains pointer to char object:-Right.
Postcondition: returns pointer to this char object which was created by
combination of concatenation and assignment operator
*/
myString operator+=(const char *right);
/*
Preconditon: length donot take any argument
Postcondition: returns length of myString object
*/
int length() const;
OR
/*
Precondition: The out of ostream object is waiting to receive the
myString output.
Postcondition: myString source has been passed by reference to the
ostream out and is kept const.
*/
friend ostream& operator<<(ostream& out, const myString& source);
/*
Precondition: The in of istream object is waiting to receive the
myString input.
Postcondition: myString source has been passed by reference into
the istream 'in'.
*/
friend istream& operator>>(istream& in, myString &source);
/*
Precondition:- Input argument contains address to two myString object:
- Left and Right.
Postcondition: function return's true, if Left < Right, else it return's
false.
*/
friend bool operator<(const myString &Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's true, if Left <= Right, else it
return's false.
*/
friend bool operator<=(const myString &Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's true, if Left == Right, else it
return's false.
*/
friend bool operator==(const myString &Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's true, if Left != Right, else it
return's false.
*/
friend bool operator!=(const myString &Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's true, if Left >= Right, else it
return's false.
*/
friend bool operator>=(const myString &Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's true, if Left > Right, else it
return's false.
*/
friend bool operator>(const myString &Left, const myString &Right);
/*
Precondition:- Input argument contains address to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left < Right, else it
return's false.
*/
friend bool operator<(const myString &Left, const char* Right);
/*
Precondition:- Input parameters contains reference to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left <= Right, else it
return's false.
*/
friend bool operator<=(const myString &Left, const char* Right);
/*
Precondition:- Input parameters contains reference to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left == Right, else it
return's false.
*/
friend bool operator==(const myString &Left, const char* Right);
/*
Precondition:- Input parameters contains reference to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left != Right, else it
return's false.
*/
friend bool operator!=(const myString &Left, const char* Right);
/*
Precondition:- Input parameters contains reference to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left >= Right, else it
return's false.
*/
friend bool operator>=(const myString &Left, const char* Right);
/*
Precondition:- Input parameters contains reference to myString object
and c_string:- Left and Right.
Postcondition: function return's true, if Left > Right, else it
return's false.
*/
friend bool operator>(const myString &Left, const char* Right);
/*
Precondition:- Input argument contains address to c_string and myString
object:- Left and Right.
Postcondition: function return's true, if Left < Right, else it return's
false.
*/
friend bool operator<(const char* Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to c_string and
myString object:- Left and Right.
Postcondition: function return's true, if Left <= Right, else it
return's false.
*/
friend bool operator<=(const char* Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to c_string and
myString object:- Left and Right.
Postcondition: function return's true, if Left == Right, else it
return's false.
*/
friend bool operator==(const char* Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to c_string and
myString object:- Left and Right.
Postcondition: function return's true, if Left != Right, else it
return's false.
*/
friend bool operator!=(const char* Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to c_string and
myString object:- Left and Right.
Postcondition: function return's true, if Left >= Right, else it
return's false.
*/
friend bool operator>=(const char* Left, const myString &Right);
/*
Precondition:- Input parameters contains reference to c_string and
myString object:- Left and Right.
Postcondition: function return's true, if Left > Right, else it
return's false.
*/
friend bool operator>(const char* Left, const myString &Right);
/*
Preconditon: Input argument contains two argument, a stream and the
delimiting character.
Postcondition: Reads character by character in a loop. Use the in.
getline() function to do the reading of the input into a non-dynamic
array, then use strcpy() to copy it into your data member. return void.
*/
void read(istream& inString,char delim);
/*
Precondition:- Input parameters contains reference to two myString
object:- Left and Right.
Postcondition: function return's addition of two myString objects.
*/
friend const myString operator+(const myString &left, const myString &right);
/*
Preconditon: Input argument contains value of index.
Postcondition: Returns the index to myString specifying the char to
that location which is const.
*/
char operator[](int index) const;
/*
Preconditon: Input argument contains value of index.
Postcondition: Returns the index to myString specifying the char to
that location.
*/
char& operator[](int index);
private:
char *desc;
};
}
#endif
myString.cpp
#include <cassert>
#include "myString.h"
using namespace std;
namespace cs_myString {
/*
This part initialize desc with memory of size 1 and copy empty string to it.
*/
myString::myString() {
desc = new char[1];
strcpy(desc, "");
}
/*
The parameterized constructor takes pointer argument pointing to the object.
*/
myString::myString(const char *inDesc) {
desc = new char[strlen(inDesc) + 1];
strcpy(desc, inDesc);
}
/*
The parameterized construtor takes one reference parameter the address to the
object location.
*/
myString::myString(const myString& right) {
desc = new char[strlen(right.desc) + 1];
strcpy(desc, right.desc);
}
myString::~myString() {
delete [] desc;
}
/*
This part has the overloaded operator = that takes one argument reference to
object and is kept const.
*/
myString myString::operator=(const myString& right) {
if (this != &right) {
delete [] desc;
desc = new char[strlen(right.desc) + 1];
strcpy(desc, right.desc);
}
return *this;
}
/*
These parts overloaded operators, and are able to compare myString objects to
other myStrings as well as myStrings to c-strings
*/
bool operator==(const myString& left, const myString& right) {
return strcmp(left.desc, right.desc) == 0;
}
bool operator==(const myString& left, const char* right) {
return strcmp(left.desc, right) == 0;
}
bool operator==(const char* left, const myString& right) {
return strcmp(left, right.desc) == 0;
}
bool operator<(const myString& left, const myString& right) {
return strcmp(left.desc, right.desc) < 0;
}
bool operator<(const myString& left, const char* right) {
return strcmp(left.desc, right) < 0;
}
bool operator<(const char* left, const myString& right) {
return strcmp(left, right.desc) < 0;
}
bool operator!=(const myString& left, const myString& right) {
return !(left == right);
}
bool operator!=(const myString& left, const char* right) {
return !(left == right);
}
bool operator!=(const char* left, const myString& right) {
return !(left == right);
}
bool operator>(const myString& left, const myString& right) {
return !(left == right) && !(left < right);
}
bool operator>(const myString& left, const char* right) {
return !(left == right) && !(left < right);
}
bool operator>(const char* left, const myString& right) {
return !(left == right) && !(left < right);
}
bool operator<=(const myString& left, const myString& right) {
return left < right || left == right;
}
bool operator<=(const myString& left, const char* right) {
return left < right || left == right;
}
bool operator<=(const char* left, const myString& right) {
return left < right || left == right;
}
bool operator>=(const myString& left, const myString& right) {
return !(left < right);
}
bool operator>=(const myString& left, const char* right) {
return !(left < right);
}
bool operator>=(const char* left, const myString& right) {
return !(left < right);
}
/*
This part return length of string in int.
*/
int myString::length() const {
return (int) strlen(desc);
}
/*
This part overloaded operator << function takes computed address of source and
is passed to out object of ostream to display results.
*/
ostream& operator<<(ostream& out, const myString& source) {
out << source.desc;
return out;
}
/*
This part overload The Square Brackets returns a const char for the index returned.
*/
char myString::operator[](int index) const {
assert(index >= 0 && index < strlen(desc));
return desc[index];
}
/*
This part overload The Square Brackets returns an reference to char at that
index.
*/
char& myString::operator[](int index) {
assert(index >= 0 && index < strlen(desc));
return desc[index];
}
/*
This part overloaded Extraction >> operator function takes address of source.
*/
istream& operator>>(istream& in, myString &source)
{
char temp[127];
delete [] source.desc;
in >> temp;
source.desc = new char[strlen(temp) + 1 ];
strcpy(source.desc, temp);
return in;
}
/*
The read() function returns void and takes two arguments, a stream and
the delimiting character. It does not skip leading spaces.
*/
void myString::read(istream &source, char delim)
{
char temp[127];
delete [] desc;
source.getline(temp,127,delim);
desc = new char[strlen(temp) + 1 ];
strcpy(desc,temp);
}
/*
This part overloaded operator + function, takes two parameter which is reference to
myString 'left' & 'right' and is declared const.
*/
const myString operator+(const myString &left, const myString &right)
{
myString temp;
temp = new char[strlen(left.desc) + strlen(right.desc) + 1];
strcpy(temp.desc, left.desc);
strcat(temp.desc, right.desc);
return temp;
}
/*
This part overloaded the shorthand += to combine concatenation and assignment.
*/
myString myString::operator+=(const myString& right)
{
myString temp;
temp = new char[strlen(right.desc) + 1];
delete [] desc;
desc = new char[strlen(temp.desc) + strlen(right.desc) + 1];
strcat(desc, right.desc);
return *this;
}
/*
This part overloaded the shorthand += to combine concatenation and assignment.
*/
myString myString::operator+=(const char *right)
{
myString temp;
temp = new char[strlen(right) + 1];
delete [] desc;
desc = new char[strlen(temp.desc) + strlen(right) + 1];
strcat(desc, right);
return *this;
}
}
Explanation / Answer
Note:
Given code is used in the solution.
Solution:
myString.h
#ifndef myString_h
#define myString_h
#include <iostream>
namespace cs_mystring {
class myString
{
private:
char *desc;
public:
/*
Preconditon: Takes no parameter and return nothing.
Postcondition: Initialize data member-'desc' with memory of size 1 and
copy empty string to it
*/
myString();
/*
Preconditon: Takes one argument - pointer to char object 'inDesc' and
is kept const
Postcondition: object is created with size accordingly with specified
object pointer given at input
*/
myString(const char *inDesc);
/*
Preconditon: Takes one argument - reference to myString object 'right'
and is kept const
Postcondition: object is created with size accordingly with specified
object reference given at input
*/
myString(const myString &right);
/* Preconditon: an myString object exist with valid length
Postcondition: myString object is destroyed
*/
~myString();
char operator[](int index)const;
char& operator[](int index);
/*
Preconditon: length donot take any argument
Postcondition: returns length of myString object
*/
long length()const;
/* Precondition: The out of ostream object is waiting to receive the
myString output.
Postcondition: myString source has been passed by reference to the
ostream out and is kept const.
*/
friend std::ostream& operator<<(std::ostream& out, const myString& source);
/*
Preconditon: Input argument contains address to myString object:-Right.
Postcondition: object is copied with size accordingly with specified
object reference given at input
*/
myString operator=(const myString& right);
/*
Preconditon: Input argument contains address to myString object:-Right.
Postcondition: returns pointer to this object which was created by
combination of concatenation and assignment operator
*/
myString operator+=(const myString& right);
//myString operator=(const myString &right);
friend bool operator>(const myString &left, const myString &right);
friend bool operator<(const myString &left, const myString &right);
friend bool operator>=(const myString &left, const myString &right);
friend bool operator<=(const myString &left, const myString &right);
friend bool operator==(const myString &left, const myString &right);
friend bool operator!=(const myString &left, const myString &right);
friend std::istream& operator>>(std::istream& in, myString& source);
friend myString operator+(const myString& left, const myString& right);
void read(std::istream& inString, char delim);
};
}
#endif
myString.cpp
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <cassert>
#include "myString.h"
using namespace std;
namespace cs_mystring {
myString::myString()
{
desc = new char[1];
strcpy(desc, "");
}
myString::myString(const char *inDesc)
{
desc = new char[strlen(inDesc) + 1];
strcpy(desc, inDesc);
}
myString::myString(const myString& right)
{
desc = new char[strlen(right.desc) + 1];
strcpy(desc, right.desc);
}
myString::~myString()
{
delete [] desc;
}
myString myString::operator=(const myString &right)
{
if (this != &right)
{
delete [] desc;
desc = new char[strlen(right.desc) + 1];
strcpy(desc, right.desc);
}
return *this;
}
char myString::operator[](int index)const
{
assert(index >= 0 && index < strlen(desc));
return desc[index];
}
char& myString::operator[](int index)
{
assert(index >= 0 && index < strlen(desc));
return desc[index];
}
// will return the length of the string without changing the calling object
long myString::length()const
{
long length = strlen(desc);
return length;
}
// insertion overload
ostream& operator<<(ostream& out, const myString& source)
{
out << source.desc;
return out;
}
// RELATIONAL OPERATORS
bool operator>(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) > 0)
return true;
return false;
}
bool operator<(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) < 0)
return true;
return false;
}
bool operator>=(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) >= 0)
return true;
return false;
}
bool operator<=(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) <= 0)
return true;
return false;
}
bool operator==(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) == 0)
return true;
return false;
}
bool operator!=(const myString &left, const myString &right)
{
if(strcmp(left.desc, right.desc) != 0)
return true;
return false;
}
// temp will be a temporary char array that we will use to hold the values
// of the instream
istream& operator>>(istream& in, myString& source)
{
while (isspace(in.peek())){
in.ignore();
}
char temp[128];
in.getline(temp, 127, ' ');
delete [] source.desc;
source.desc = new char[strlen(temp) +1];
strcpy(source.desc, temp);
return in;
}
// the strLength variable will hold the length of the two strings and
// will add one for the delimiter character
//
// temp will be a temporary string that will be returned as a
result of the
// addition, since both of the arguments are consts
myString operator+(const myString& left, const myString&
right)
{
long strLength = strlen(left.desc);
strLength += strlen(right.desc);
myString temp = new char[strLength + 1];
strcpy(temp.desc, left.desc);
strcat(temp.desc, right.desc);
return temp;
}
// char is a temp array that we will use to read in the
instream file,
// and we will rely on strcpy on how to add it into our this
variable
void myString::read(std::istream& inString, char delim)
{
char temp[128];
inString.getline(temp, 127, ' ');
delete [] this->desc;
this->desc = new char[strlen(temp) +1];
strcpy(this->desc, temp);
}
// the strLength variable is used to hold the length of both
of the variables
// and add one for the ending character
//
// the temp myString object is used to temporarily hold the
value of the char
// array before we copy it in
myString myString::operator+=(const myString& right)
{
long strLength = strlen(this->desc) + strlen(right.desc) +
1;
myString temp = new char[strLength];
strcpy(temp.desc, this->desc);
delete [] this->desc;
this->desc = new char[strLength];
strcpy(this->desc, temp.desc);
strcat(this->desc, right.desc);
return *this;
}
}
main.cpp
#include "myString.h"
#include <fstream>
#include <cctype> // for toupper()
#include <string>
#include <cassert>
#include <iostream>
using namespace std;
using namespace cs_mystring;
bool eof(istream& in);
void BasicTest();
void RelationTest();
void ConcatTest();
void CopyTest();
myString AppendTest(const myString& ref, myString val);
string boolString(bool convertMe);
int main()
{
BasicTest();
RelationTest();
ConcatTest();
CopyTest();
system("pause");
return 0;
}
bool eof(istream& in)
{
char ch;
in >> ch;
in.putback(ch);
return !in;
}
string boolString(bool convertMe) {
if (convertMe) {
return "true";
} else {
return "false";
}
}
void BasicTest()
{
myString s;
cout << "----- Testing basic String creation & printing" << endl;
const myString strs[] =
{myString("Wow"), myString("C++ is neat!"),
myString(""), myString("a-z")};
for (int i = 0; i < 4; i++){
cout << "string [" << i <<"] = " << strs[i] << endl;
}
cout << endl << "----- Now reading MyStrings from file" << endl;
cout << endl << "----- first, word by word" << endl;
ifstream in("mystring.txt");
assert(in);
while (in.peek() == '#'){
in.ignore(128, ' ');
}
in >> s;
while (in) {
cout << "Read string = " << s << endl;
in >> s;
}
in.close();
cout << endl << "----- now, line by line" << endl;
ifstream in2("mystring.txt");
assert(in2);
while (in2.peek() == '#'){
in2.ignore(128, ' ');
}
s.read(in2, ' ');
while (in2) {
cout << "Read string = " << s << endl;
s.read(in2, ' ');
}
cout << endl << "----- Testing access to characters (using const)" << endl;
const myString s1("abcdefghijklmnopqsrtuvwxyz");
cout << "Whole string is " << s1 << endl;
cout << "now char by char: ";
for (int i = 0; i < s1.length(); i++){
cout << s1[i];
}
cout << endl << "----- Testing access to characters (using non-const)" << endl;
myString s2("abcdefghijklmnopqsrtuvwxyz");
cout << "Start with " << s2;
for (int i = 0; i < s2.length(); i++){
s2[i] = toupper(s2[i]);
}
cout << " and convert to " << s2 << endl;
}
void RelationTest()
{
cout << " ----- Testing relational operators between MyStrings ";
const myString strs[] =
{myString("app"), myString("apple"), myString(""),
myString("Banana"), myString("Banana")};
for (int i = 0; i < 4; i++) {
cout << "Comparing " << strs[i] << " to " << strs[i+1] << endl;
cout << " Is left < right? " << boolString(strs[i] < strs[i+1]) << endl;
cout << " Is left <= right? " << boolString(strs[i] <= strs[i+1]) << endl;
cout << " Is left > right? " << boolString(strs[i] > strs[i+1]) << endl;
cout << " Is left >= right? " << boolString(strs[i] >= strs[i+1]) << endl;
cout << " Does left == right? " << boolString(strs[i] == strs[i+1]) << endl;
cout << " Does left != right ? " << boolString(strs[i] != strs[i+1]) << endl;
}
cout << " ----- Testing relations between MyStrings and char * ";
myString s("he");
const char *t = "hello";
cout << "Comparing " << s << " to " << t << endl;
cout << " Is left < right? " << boolString(s < t) << endl;
cout << " Is left <= right? " << boolString(s <= t) << endl;
cout << " Is left > right? " << boolString(s > t) << endl;
cout << " Is left >= right? " << boolString(s >= t) << endl;
cout << " Does left == right? " << boolString(s == t) << endl;
cout << " Does left != right ? " << boolString(s != t) << endl;
myString u("wackity");
const char *v = "why";
cout << "Comparing " << v << " to " << u << endl;
cout << " Is left < right? " << boolString(v < u) << endl;
cout << " Is left <= right? " << boolString(v <= u) << endl;
cout << " Is left > right? " << boolString(v > u) << endl;
cout << " Is left >= right? " << boolString(v >= u) << endl;
cout << " Does left == right? " << boolString(v == u) << endl;
cout << " Does left != right ? " << boolString(v != u) << endl;
}
void ConcatTest()
{
cout << " ----- Testing concatentation on MyStrings ";
const myString s[] =
{myString("outrageous"), myString("milk"), myString(""),
myString("cow"), myString("bell")};
for (int i = 0; i < 4; i++) {
cout << s[i] << " + " << s[i+1] << " = " << s[i] + s[i+1] << endl;
}
cout << " ----- Testing concatentation between myString and char * ";
const myString a("abcde");
const char *b = "XYZ";
cout << a << " + " << b << " = " << a + b << endl;
cout << b << " + " << a << " = " << b + a << endl;
cout << " ----- Testing shorthand concat/assign on MyStrings ";
myString s2[] =
{myString("who"), myString("what"), myString("WHEN"),
myString("Where"), myString("why")};
for (int i = 0; i < 4; i++) {
cout << s2[i] << " += " << s2[i+1] << " = ";
cout << (s2[i] += s2[i+1]) << "and";
cout << s2[i] << endl;
}
cout << " ----- Testing shorthand concat/assign using char * ";
myString u("I love ");
const char *v = "programming";
cout << u << " += " << v << " = ";
cout << (u += v) << endl;
}
myString AppendTest(const myString& ref, myString val)
{
val[0] = 'B';
return val + ref;
}
void CopyTest()
{
cout << " ----- Testing copy constructor and operator= on MyStrings ";
myString orig("cake");
myString copy(orig); // invoke copy constructor
copy[0] = 'f'; // change first letter of the *copy*
cout << "original is " << orig << ", copy is " << copy << endl;
myString copy2; // makes an empty string
copy2 = orig; // invoke operator=
copy2[0] = 'f'; // change first letter of the *copy*
cout << "original is " << orig << ", copy is " << copy2 << endl;
copy2 = "Copy Cat";
copy2 = copy2; // copy onto self and see what happens
cout << "after self assignment, copy is " << copy2 << endl;
cout << "Testing pass & return MyStrings by value and ref" << endl;
myString val = "winky";
myString sum = AppendTest("Boo", val);
cout << "after calling Append, sum is " << sum << endl;
cout << "val is " << val << endl;
val = sum;
cout << "after assign, val is " << val << endl;
}
Result:
----- Testing basic String creation & printing
string [0] = Wow
string [1] = C++ is neat!
string [2] =
string [3] = a-z
----- Now reading MyStrings from file
----- first, word by word
Read string = The
Read string = first
Read string = time
Read string = we
Read string = will
Read string = read
Read string = individual
Read string = words,
Read string = next
Read string = we
Read string = read
Read string = whole
Read string = lines
----- now, line by line
Read string = The first time we will
Read string = read individual words, next
Read string = we read whole lines
----- Testing access to characters (using const)
Whole string is abcdefghijklmnopqsrtuvwxyz
now char by char: abcdefghijklmnopqsrtuvwxyz
----- Testing access to characters (using non-const)
Start with abcdefghijklmnopqsrtuvwxyz and convert to ABCDEFGHIJKLMNOPQSRTUVWXYZ
----- Testing relational operators between MyStrings
Comparing app to apple
Is left < right? true
Is left <= right? true
Is left > right? false
Is left >= right? false
Does left == right? false
Does left != right ? true
Comparing apple to
Is left < right? false
Is left <= right? false
Is left > right? true
Is left >= right? true
Does left == right? false
Does left != right ? true
Comparing to Banana
Is left < right? true
Is left <= right? true
Is left > right? false
Is left >= right? false
Does left == right? false
Does left != right ? true
Comparing Banana to Banana
Is left < right? false
Is left <= right? true
Is left > right? false
Is left >= right? true
Does left == right? true
Does left != right ? false
----- Testing relations between MyStrings and char *
Comparing he to hello
Is left < right? true
Is left <= right? true
Is left > right? false
Is left >= right? false
Does left == right? false
Does left != right ? true
Comparing why to wackity
Is left < right? false
Is left <= right? false
Is left > right? true
Is left >= right? true
Does left == right? false
Does left != right ? true
----- Testing concatentation on MyStrings
outrageous + milk = outrageousmilk
milk + = milk
+ cow = cow
cow + bell = cowbell
----- Testing concatentation between myString and char *
abcde + XYZ = abcdeXYZ
XYZ + abcde = XYZabcde
----- Testing shorthand concat/assign on MyStrings
who += what = whowhatandwhowhat
what += WHEN = whatWHENandwhatWHEN
WHEN += Where = WHENWhereandWHENWhere
Where += why = WherewhyandWherewhy
----- Testing shorthand concat/assign using char *
I love += programming = I love programming
----- Testing copy constructor and operator= on MyStrings
original is cake, copy is fake
original is cake, copy is fake
after self assignment, copy is Copy Cat
Testing pass & return MyStrings by value and ref
after calling Append, sum is BinkyBoo
val is winky
after assign, val is BinkyBoo
Press any key to continue . . .
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