memcpy函数的实现.strcpy函数

 memcpy函数的实现.
//把src指向的对象中的num个字符拷贝到dest所指向的对象中，返回指向结果对象的指针.void *memcpy(void *dest, void *src, size_t num){char *pd = (char *)dest;char *ps = (char *)src;while (num-- && *ps != '\0')*pd++ = *ps++ ;return dest;}

//实strcpy函数现

char *strcpy(char *des,char *src){if(src == NULL)return NULL;char *address = des;while((*des++ = *src++) != '\0');return address;}