C/C++ strtol/strtoul sample

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
int main(int argc, char *argv[])
{
    if (argc <= 1)
    {
        puts("strtol [string]");
        return 1;
    }

    const char *s = argv[1];
    char *endptr = NULL;
    int err = 0;

    long l = strtol(s, &endptr, 10);
    err = errno;

    printf("strtol => %ld, endptr = %s, errno = %d\n", l,
        endptr == NULL ? "NULL" : endptr, err);

    unsigned long ul = strtoul(s, &endptr, 10);
    err = errno;

    printf("strtoul => %lu, endptr = %s, errno = %d\n", ul,
        endptr == NULL ? "NULL" : endptr, err);

    printf("*Note: ERANGE = %d\n", ERANGE);
    printf("*Note: LONG_MIN = %ld\n", LONG_MIN);
    printf("*Note: LONG_MAX = %ld\n", LONG_MAX);
    printf("*Note: ULONG_MAX = %lu\n", ULONG_MAX);

    return 0;
}