convert.c

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/**
 * Demonstrates the difference between atoi() and strtol(). If possible, use
 * strtol so you can check for conversion errors.
 */

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

int main(void)
{
    char *str = "University of San Francisco";

    int i = atoi(str);
    printf("%d\n", i);

    char *endptr;
    long j = strtol(str, &endptr, 10);
    if (endptr == str) {
        printf("Unconvertable! (Is that a word?)\n");
        perror("strtol");
    }
    if (j <= INT_MAX) {
        /* We can convert this to an int (if you specifically need one): */
        i = (int) j;
    }

    return 0;
}