Files In C++

 Files

     Hello reader, today my tutorial is about Files in C++. We use Files in C++ to add values to progamme to outer source.

     Imagine we have outer file called "data.txt" and it has two value 10 and 20. We need add this value to our c++ programme.

•      So do that first we need to declare the header file like this,

             #include<fstream>

•      We can open our outer source file using following command,

             ifstream abc(data.txt)

•      Also if you want to check your given File name (data.txt) is correct you can use following statements,

             If(abc.fail)
               {
                   cout<<"Error"<<endl;
                      return -1;       
               }

     Using all of these methods you can write successful programme like this,

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    int no1, no2;
    
    //input data.txt
    ifstream abc(data.txt);

    //check the output file
    if(abc.fail())
      {
        return -1;
      }

    //assign output files to variables
    abc>>no1;
    abc>>no2;

    cout<<no1<<" "<<no2<<endl;

 return 0;
}