字符串比较大小的函数实现

/*
 * 字符串比较大小(类似于String的CompareTo()方法)
 */
#include<stdio.h>
#include<stdlib.h>

int compare(const char *s1,const char *s2)
{
 while(*s1!='\0'&&s2!='\0')
 {
  if(*s1==*s2)
  {
   s1++;
   s2++;
  }
  else if(*s1>*s2)
  {
   return 1;
  }
  else
  {
   return -1;
  }
 }
 if(*s1=='\0'&&*s2=='\0')return 0;
 else if(*s1!='\0'&&*s2=='\0')return 1;
 else return -1;
}

int main()
{
 const char *s1="abc";
 const char *s2="abc";
 int result=compare(s1,s2);
 printf("result=%d\n",result);
 return 0;
}