模拟memcpy

void my_memcpy(void *dest, const void *src,int num){assert(dest&&src);assert(num>0);char*Pdest = (char*)dest;char*Psrc = (char*)src;while (num--&&Pdest&&Psrc){*Pdest++ = *Psrc++;}}int main(){char str[] = "niaho";char* str1 = "shit";my_memcpy(str,str1,78);printf("%s",str);}