字符串拷贝的简单C语言实现

#include <stdio.h>

void main()

{

char a[] = "123";

char b[10];

char *s, *p;

s = a;

p = b;

        //取s的值，s自加，取p的值，p自加，将old_s的值赋给old_p

while(*p++ = *s++);

s = NULL;

p = NULL;

printf("%s\n", b);

}