#include <stdio.h>
#include <stdlib.h>
int main( void )
{
    int  num;
    FILE *fptr1;
    fptr1 = fopen( "abc.txt", "r" );
    if ( fptr1 == NULL ) {
        printf( "Oh, no! no abc.txt!\n" );
        exit( 1 );
    }
    fscanf( fptr1, "%d", &num );
    fclose( fptr1 );
}