记录一些与字符串相关的算法
strcmp
/*
字符串比较函数
s1 = s2: return 0;
s1 > s2: return 1;
s1 < s2: return -1;
*/
int strcmp(const char* s1, const char* s2){
if(NULL == s1 || NULL == s2)
throw "Invalid arguments";
int ret = 0;
while(!(ret=*s1-*s2) && *s1 && *s2){
++s1;
++s2;
}
if(ret > 0){
ret = 1;
}else if(ret < 0){
ret = -1
}
return ret;
}
strcpy
/*
把从s2地址开始且含有'\0'结束符的字符串复制到以s1开始的地址空间
*/
char* strcpy(char* s1, const char* s2){
if(NULL == s1 || NULL == s2)
throw "Invalid arguments";
char* p = s1;
while((*s1++ = *s2++) != '\0');
return p;
}
