#include<iostream>
 #include <assert.h>
 using namespace std;

 void myStrcpy(char* Dest, const char *Src)
 {
     assert((Dest!= NULL)&&(Src!=NULL));
     while((*Dest = *Src)!='/0')
     {
         Dest++;
         Src++;
     }
 }

 int main()
 {
     char dest[] = "helloworld";//注意
     char* src = "hello";
     myStrcpy(dest, src);
     printf("%s",dest);
     return 0;
 }