用指针实现strcpy功能

#include <stdio.h>
int main(int argc, const char *argv[])
{
    char a[45]="hello word";
    char b[45]="xjwkkk";
    char *p1=a;
    char *p2=b;
    while(*p2)
    {
        *p1=*p2;
        p1++;
        p2++;
    }
    printf("%s\n%s\n",a,b);

    return 0;
}