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Solution for Exercise 22-6

ex2206

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

int main()
{
    FILE *handle;
    int highscore;

    handle = fopen("scores.dat","w");
    if(!handle)
    {
        puts("File error!");
        exit(1);
    }
    printf("What is your high score? ");
    scanf("%d",&highscore);
    fprintf(handle,"%d",highscore);
    fclose(handle);
    puts("Score saved");
    return(0);
}

Notes

* Up until the C99 standard, the b character was required when reading from or writing to binary files. So the fopen() function in Line 9 would read:

    handle = fopen("scores.dat","wb");

Current compilers no longer need the b character and, if specified, it's ignored. Here are the comments from the current (C11) fopen() man page:

The mode string can also include the letter ``b'' either as last charac-
ter or as a character between the characters in any of the two-character
strings described above. This is strictly for compatibility with ISO/IEC
9899:1990 (``ISO C90'') and has no effect; the ``b'' is ignored.