Question

Wrtie a C++ program to read and display the test data entered from keyboard and stored in the infor.dat file.

Answer 1

Code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
    
   fstream newfile;
   newfile.open("infor.dat",ios::out);  // open a file to perform write operation using file object
   
   if(newfile.is_open()) //checking whether the file is open
   {
      string x;
      
      cout<<"Enter test data: ";
      getline(cin,x); // taking input from keyboard
      
      newfile<<x<<"\n";   //inserting text
      newfile.close();    //close the file object
   }
   
   cout<<"\nNow reading from the file: \n\n";
   
   newfile.open("infor.dat",ios::in); //open a file to perform read operation using file object
   
   if (newfile.is_open()){   //checking whether the file is open
      string tp;
      while(getline(newfile, tp)){ //read data from file object and put it into string.
         cout << tp << "\n"; //print the data of the string
      }
      newfile.close(); //close the file object.
   }
}

Output:

infor.dat at the beginning of execution of the program.

Run Debug Stop Share A Save {} Beautify Language C++ main.cpp infor.dat < input Writing to the file Enter test data: Is • GDB

program execution:

23 24 newfile.open("infor.dat", ios::in); //open a file to perform read input Enter test data: This is test data hello 123 Now reading from the file: This is test data hello 123 ... Program finished with exit code 0 Press ENTER to exit console. GDB

infor.dat at the end of execution of the program.

main.cpp infor.dat 1 This is test data hello 123 2 input Enter test data: This is test data hello 123 Now reading from the file: This is test data hello 123 .. Program finished with exit code 0 Press ENTER to exit console.

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