#include <stdio.h>
#include <stdlib.h>

int main ( int argc, char **argv )
{
    FILE  *fp;

    if ( argc != 2 ) {
        printf("### You need a file name.\n");
        exit (EXIT_FAILURE);
    }

    fp = fopen(argv[1], "w");
    if ( fp == NULL ) {
        printf( "### Could not write a file [%s].\n", 
               argv[1]);
        exit (EXIT_FAILURE);
    }

    fprintf( fp, "%s\n", "Neural networks are interesting.");
    if ( 0 != fclose( fp ) ) {
    printf("### Could not close a file [%s].\n", argv[1]);
        exit (EXIT_FAILURE);
    }
    return  EXIT_SUCCESS;
}