C++ program with file input and output String Processing Labs Directions: Write

Question

C++ program with file input and output

String Processing Labs Directions: Write a main program to test the three functions described below. Input is from a file, and output is to a file 1. The function processes a string containing letters of the alphabet, which is a parameter. Another parameter is a char variable with a letter value. The function outputs the number of times the char value appears in the string. 2. This Boolean function has two string parameters. It returns true when the first string is a substring of the second string, otherwise it returns false. 3. The input is on one line in an input file, and has up to seven components with a colon () at the end of each component. The function separates each component into separate strings (without the colon), and outputs each separated string along with its length. In the output file, use one line for each separated string. One input sample could be George: April:May: William:Johnny: Another input could be Red:Fuscia:Magenta: A third input example is (note internal spaces) Hello, there. How are you?:I'm fine. Let's go out to dinner.

Explanation / Answer

Hi,

I belive for first two questions input file reading and writing in not required, as per my undersating we need to implement the functions for first two question, anyway I've implemented functions and file reading and writing as well.

For question 1 input formateis: string space character

Ex: testtest t

For question 2 input format is: string1 space string2

Ex: test testing

For Question 3 you have already mentioned input format above.

Pls. find the below code.

#include <iostream>

#include <fstream>

#include <string>

#include <vector>

using namespace std;

vector<string> split(string str, char token){

vector<string> vec;

string s = "";

for(int i=0; i<str.size(); i++){

if(str[i]==token){

vec.push_back(s);

s="";

}

else{

s+=str[i];

}

}

if(s.length()>0){

vec.push_back(s);

}

return vec;

}

// Function 1

int countChars(string str, char chr){

int count = 0;

for(int i=0; i<str.length(); i++){

if(str[i]==chr){

count++;

}

}

return count;

}

// Function 2

bool isSubString(string str1, string str2){

size_t flag = str2.find(str1);

if(flag!=string::npos){

return true;

}

else{

return false;

}

}

// Function 3

void wordCount(){

ifstream file("C:\Users\user\Desktop\input3.txt");

ofstream outfile("C:\Users\user\Desktop\output3.txt");

string line;

getline(file, line);

vector<string> token = split(line, ':');

for(int i=0; i<token.size(); i++){

//cout<<token[i]<<" "<<token[i].length()<<endl;

outfile << token[i] <<" "<<token[i].length()<<endl;

}

file.close();

outfile.close();

}

int main(){

ifstream f1("C:\Users\user\Desktop\input1.txt");

ifstream f2("C:\Users\user\Desktop\input2.txt");

ofstream o1("C:\Users\user\Desktop\output1.txt");

ofstream o2("C:\Users\user\Desktop\output2.txt");

// Reading file for case 1

string line1;

getline(f1, line1);

vector<string> token1 = split(line1, ' ');

int output1 = countChars(token1[0], token1[1][0]);

o1<<output1<<endl;

f1.close();

o1.close();

// Reading file for case 2

string line2;

getline(f2, line2);

vector<string> token2 = split(line2, ' ');

bool output2 = isSubString(token2[0], token2[1]);

if(output2){

o2<<"true"<<endl;

}

else{

o2<<"false"<<endl;

}

f2.close();

o2.close();

// Case 3

wordCount();

system("pause");

return 0;

}

Hope this is helpful :)

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