strcpy源码实现方式

#include<bits/stdc++.h>
using namespace std;

char *strcpy(char *a,const char *b)
{
    if(a == NULL || b == NULL)
    exit(0);
    char *c = a;
    while((*a++ = *b++) != '\0');
    return c;
}

int main()
{
    char a[2] = "a";
    char b[] = "bdfasdfdsfab";
    strcpy(a,b);
    cout << a << endl;
    return 0;
}