【C语言】【面试题】【笔试题】模拟实现数据库中strcmp函数

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

int my_strcmp1(const char *dest,const char *src)//方法1
{
assert(dest);
assert(src);
while (*dest==*src)
{
if (*dest == '\0')
{
return 0;
}
dest++;
src++;
}
return *dest - *src;
}
int my_strcmp2(const char *dest, const char *src)//方法2
{
int ret = 0;
while (!(ret = (*(unsigned char*)dest - *(unsigned char *)src)) && *dest)
{
dest++;
src++;
}
if (ret > 0)
return 1;
else if (ret < 0)
return -1;
else
return (ret);
}

int main()
{
char arr1[] = "abcd";
char arr2[] = "abcde";
int ret = my_strcmp2(arr1, arr2);
printf("%d\n", ret);
system("pause");
return 0;
}