Answer to Question #181190 in C++ for Kanav Garg

Question

Write a program that asks the user to enter a filename followed by a command. If the user enters the command “print”, your program should print the contents of the file to the console exactly as it appears in the file. If the user enters the command “double”, your program should read each number contained in the file and print the number doubled to a separate line on the console.

 

Answer 1

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
   fstream newfile;
   newfile.open("testing.txt",ios::out);
   if(newfile.is_open())
   {
      newfile<<"Testing of print statement \n";
      newfile.close();
   }
   newfile.open("testing.txt",ios::in); //open a file to perform read operation using file object
   if (newfile.is_open()){   //checking whether the file is open
      string tp,command;
      cout<<"Please enter the command: print or double"<<endl;
      cin>>command;
      if(command=="print"){

        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.
      }else{
      cout<<"test doble."<<endl;
      }

   }
}