strcmp.c

几个C++库函数,也是经常用来测试编程实力的函数!

////////   comparing strings     ///////
#include <iostream>

int strcmp(const char *r, const char *s)
{   while (*r == *s)
    {       if (*r == '\0') return 0;
            r++; s++;
    }
    return(*r - *s);
}

int main()
{  char * a="abcd";
   char * b="abd";
   if (strcmp(a,b)  < 0) 
        std::cout << "OK" << std::endl;
   return 0;
}