snprintf.c

#include <stdio.h>

#ifdef __GNUC__
    #pragma GCC diagnostic ignored "-Wformat-truncation"
#endif

int
main (void)
{
    char string[8 + 1];

    printf ("The following string should be 10 digits long\n");
    snprintf (string, sizeof(string), "1234567890");
    printf ("%s\n", string);
    printf ("But it's only 8, which is one fewer than the char array length\n");

    return 0;
}