strcpy自己实现

#include //printf

#include //ssert

#include //malloc

#include //strlen

char * sstrcpy(char * strdst, char * strsrc)

{

char *dst = strdst;

assert(strdst!=NULL && strsrc!=NULL);

while((*strdst++ = *strsrc++)!= '\0')

NULL;

return dst; //实现链式表达式

}

//int num = strlen(strcpy(strdst,"hello world"));

int main(void)

{

int num;

char *strdst = (char *)malloc(sizeof(char)*100);

if(strdst == NULL)

return (-1);

num = strlen(sstrcpy(strdst,"hello world"));

printf("%d\n", num);

return 0;

}