strcmp

    strcmp 库函数用于比较两个常字符串，结果为 -1、0、1.

#include <stdio.h>

int strcmp_test(const char *cs, const char *ct);

int
main(int argc, char **argv)
{
    char *s1 = "abc123";
    char *s2 = "abC123";

    printf("Result: %s - %s = %d\n", s1, s2, strcmp_test(s1, s2));

    return 0;
}

int
strcmp_test(const char *cs, const char *ct)
{
    unsigned char c1, c2;

    while (1) {
        c1 = *cs++;
        c2 = *ct++;
        if (c1 != c2) {
            return c1 < c2 ? -1 : 1;
        }
        if (!c1) {
            break;
        }
    }

    return 0;
}

注：三目运算符的运用