1: /*
2: @@
3: Author: Justinzhang
4: Email: uestczhangchao@gmail.com
5: Time: 2012-9-1 22:08:31
6: Desc: It's a problem meet a long time ago. i've tried to write many times;
7: it also occurs at different interviews. today i write again for revies.
8: God bless~
9: @@
10: */
11:
12: #include <iostream>
13: #include <cassert>
14: using namespace std;
15:
16: /*it's really a small and simple function,
17: but there so many aspects to pay attention to;*/
18: char * strcpy(char *dest, const char *str)
19: { 20: assert(str && dest);
21: char *tmp = dest;
22: while((*dest++=*str++)!=0);//this will copy '\0' to dest
23: return tmp;
24: }
25:
26: int main()
27: { 28: char *str = "hello world!";
29: char *dest = new char[strlen(str)+1]; // here it add 1 to stlen(str), cause we need a '\0'
30: assert(dest);// whenever use a pointer, first to test if it is NULL; after use it up, assign NULL to it;
31: cout << strcpy(dest,str) << endl;
32: delete []dest;
33: dest = NULL;
34: return 0;
35: }