Question

#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int main() {
 ofstream w("d:/tester.txt");
 int f = 1;
 int s = 2;
 int t = 3;
 string x = "hello";
 w << f << endl << s << endl << t << endl << x ;
 w.close();

 ifstream r("d:/tester.txt");
 r >> x;
 cout << x << endl ;
 s = s + 10 ;
 r.close();

/* ofstream wa("d:/tester.txt");
wa << s;
wa.close();*/
}

I always get the output equal to 1 .
Why is this so ? When i asked for the string hello 1 gets displayed .

Answer 1

In fact, it is the output you ask for: you are reading the first string token from the file. And that happens to be the number “1” you wrote on the first line into the file.

The streaming operators don’t magically parse your file for the most suitable token; they are simply reading the next available token. And even if they did, “1” would be a perfectly valid choice for a string.