C Plus Plus Program to Replace a specified Line in a Text File - cppexamples

Questions:

C Plus Plus Program to Replace a specified Line in a Text File

Explanation:

This C Plus Plus Program to Replace a specified Line in a Text File,

Code:

#include<iostream>

#include<fstream>

#include<string>

using namespace std;

void main() {

       fstream file;//creating txt file

       file.open("Reading.txt",ios::in); //opening file in reading mod Reading.txt file is located in your project foler

       int temp2 = 0;

       cout << "Data In Reading File" << endl;

       while (file) {

              string temp;

              getline(file, temp);

              temp2++;

       }

       cout << endl << endl;

       string *data = new string[temp2];

       temp2 = 0;

       file.close();

       file.open("Reading.txt", ios::in);

       cout << endl << endl << endl;

       while (file) {

              string temp;

              getline(file, temp);

              cout <<temp2+1<<"  "<< temp << endl;

              data[temp2] = temp;

              temp2++;

       }

       file.close();

       //writing data on file

       string data2;

       string data3;

       cout << "Enter Data that you want to replace == ";

       getline(cin, data2);

       cout << "Enter Data that you want to replace with == ";

       getline(cin, data3);

       file.open("Reading.txt", ios::out);

       for (int i = 0; i < temp2; i++) {

              if (data[i] == data2) {

                     data[i] = data3;

                     file << data[i] << endl;

              }

              else

                     file << data[i] << endl;

       }

       file.close();

       //printing just data

       file.open("Reading.txt", ios::in);

       temp2 = 0;

       while (file) {

              string temp;

              getline(file, temp);

              cout << temp2 + 1 << "  " << temp << endl;

              temp2++;

       }

}

Output:

Related Articles:


C Plus Plus Program to Create a File & Store Information

C Plus Plus Program to Illustrate Reading of Data from a File

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