自己实现strcpy函数

 1 #include     //printf
 2 #include     //ssert
 3 #include     //malloc
 4 #include     //strlen
 5 
 6 char * sstrcpy(char * strdst, char * strsrc)
 7 {
 8     char *dst = strdst;
 9     assert(strdst!=NULL && strsrc!=NULL);
10     while((*strdst++ = *strsrc++)!= '')
11         NULL;
12     return dst; //实现链式表达式
13 }
14 
15 //int num = strlen(strcpy(strdst,"hello world"));
16 
17 int main(void)
18 {
19     int num;
20     char *strdst = (char *)malloc(sizeof(char)*100);
21 
22     if(strdst == NULL)
23         return (-1);
24     num = strlen(sstrcpy(strdst,"hello world"));
25     printf("%d
", num);
26 
27     return 0;
28 }