#include <iostream>
#include <fstream>
#include <stdlib.h>
int main( void )
{
        int num;
        std::ifstream fin( "abc.txt" );
        if ( ! fin ) {
                std::cerr << "Cannot open abc.txt\n";
                exit( 1 );
        }
        fin >> num;
        std::cout << "we got '" << num << "' from abc.txt\n";
}