C++ Help! The following Program Works, but I am unsure of how to replace every l
ID: 3708558 • Letter: C
Question
C++
Help! The following Program Works, but I am unsure of how to replace every line break in a file with a single space. I need to add a LineBreak.h Thank You!
//FileFilter.H
//adding required header files
#include
#include
using namespace std;
#ifndef FileFilter_H
#define FileFilter_H
class FileFilter {
private:
int key;
public:
FileFilter(){}; //function should be defined ....
FileFilter(int key) {
this->key = key;
}
//transforming letter by encrypted key in tranform() method
char transform(char ch) const{
if (ch >= 'a' && ch <= 'z')
return ((ch- 'a') + key) % 26 + 'a';
else if (ch >='A' && ch <= 'Z')
return (((ch- 'A') + key) % 26 + 'A');//'A' is character
}
//function should be defined ....
virtual void doFilter(ifstream &in, ofstream &out)const
{
};
};
#endif
//Copy.h
//adding required header files
#include"FileFilter.h"
#include
#include
using namespace std;
#ifndef COPY_H
#define COPY_H
class Copy : public FileFilter
{
public:
//copying input file data into output file
void doFilter(ifstream &in, ofstream & out)const
{
char ch;
while (!in.eof()) {
in >> ch;
out << ch;
}
}
};
#endif
//Encryption.h
//adding required header files
#include"FileFilter.h"
#include
#include
#ifndef Encryption_H
#define Encryption_H
class Encryption : public FileFilter
{
public:
Encryption()
{
};
Encryption(int key) : FileFilter(key) {};
void doFilter(ifstream &in, ofstream &out)const
{
char ch;
while (!in.eof()) {
in >> ch;
if (isalpha(ch))
//calling transform() method to encrypt given file data
out << transform(ch);
else
out << ch;
}
}
};
#endif
//UpperCase.h
//adding required header files
#include
#include"FileFilter.h"
#include
#include
using namespace std;
#ifndef UpperCase_H
#define UpperCase_H
class UpperCase :public FileFilter
{
public:
//converting each character into uppercase by toupper() method
void doFilter(ifstream &in, ofstream &out) const
{
char ch;
while (!in.eof()) {
in >> ch;
if (isalpha(ch))
out << (char)toupper(ch);
else
out << (char)ch;
}
}
};
#endif
//Main.cpp
//adding required header files
#include"FileFilter.H"
#include"UpperCase.h"
#include"Encryption.h"
#include"Copy.h"
#include
#include
#include
using namespace std;
int main() {
string name, out1, out2, out3;
//reading input file name from user
cout << "Please enter file name: ";
cin >> name;
ofstream outFile1, outFile2, outFile3;
ifstream inFile;
inFile.open(name);
if (!inFile)
{
cout << "File cannot be oppened: ";
exit(0);
}
Encryption e;
UpperCase up;
Copy c;
do {
//menu displaying
cout << "1. Encription " << endl;
cout << "2. Transform to upper case "<< endl;
cout << "3. Copy to another file "<< endl;
cout << "4. Exit"<< endl;
int choice;
cin >> choice;
int key;
switch (choice) {
case 1:
cout << "Enter Encryption Key from 2-25: ";
cin >> key;
cout << "Please enter output file name: ";
cin >> out1;
outFile1.open(out1);
if (!outFile1) {
cout << "The file cannot be created";
exit(0);
}
e = Encryption(key);
e.doFilter(inFile, outFile1);
cout << "Encrypted Succesfully ";
outFile1.close();
break;
case 2:
//it shouldnot be open file again to avoid logical errors..beacuse input file already opened by inFile
//inFile.open(name);
cout << "Enter output file name: ";
cin >> out2;
outFile2.open(out2);
if (!outFile2) {
cout << "The file cannot be created ";
exit(0);
}
up.doFilter(inFile, outFile2);
cout << "File Transformed Succesfully ";
outFile2.close();
break;
case 3://should be gap between case and its value
//it shouldnot be open file again to avoid logical errors..beacuse input file already opened by inFile
//inFile.open(name);
cout << "enter output file Name: ";
cin >> out3;
outFile3.open(out3);
if (!outFile3) {
cout << "file cannot be created";
exit(0);
}
c.doFilter(inFile, outFile3);
cout << "File Copied Succesfully";
outFile3.close();
break;
case 4:
system("pause");
exit(0);//should include stdlib.h header file to exit() method usage
default:
cout << "Invalid Choice ";
}
system("pause");
} while (1);
inFile.close();//should be closed before exiting program
return 0;//return should be at the end of the main method
}
Explanation / Answer
Basically you want to replace a “LINE ” with “LINE ”. Intead of reading character by character, read file line by line and then replace entire line by contents and space. You need to do something similar to this:
string newstr = line;
while (std::getline(file, line))
{
newstr += line;
newstr += “ ”;
}
Now write newstr to the file, it has all the contents of the file. You can also write this newstr inside for loop into another file and then in the end copy that file to original file.
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