Thread: Binary files

Hmm... I seem to have more questions:

Code:

#include <stdio.h>

//prototypes
int start_binary (void);
void scope_test (void);

int main (void)
{
    start_binary ();

    return (0);
}

int start_binary (void)
{
    char x[10] = "ABCDEFGHIJ";
    FILE *fp = fopen ("prime_binary.txt", "wb");

    if (!fp)
    {
        printf ("\n\nERROR!  Not enough memory!\n\n");

        return (0);
    }

    fwrite (x, sizeof (x[0]), sizeof (x) / sizeof (x[0]), fp);

    scope_test ();

    fclose (fp);
    printf ("\n\n");
    return (0);
}

void scope_test (void)
{
    int loop = 0;
    char x[10] = "JIHGFEDCBA";

    FILE *fp = fopen ("prime_binary.txt", "a");

    for (loop = 0; loop < 10; loop++)
    {
        fprintf (fp, "%c", x[loop]);
    }

    fclose (fp);
}

(If there are any syntax errors, I apologize. I'm on a seperate computer and had to retype it here)

When I run this program:

1) Why doesn't Windows crash when I attempt to open a file twice (especially in different modes)?

2) Why do I only have 1 line instead of 2 in my text file after this program is finished running? I was trying to "append" in my scope_test function to see what would happen.

Thanks!

mw