#include <Windows.h>
#include <iostream>

using namespace std;
int swap(int* a, int* b) {
	int temp = *a;
	*a = *b;
	*b = temp;
	return 0;
}

void  boy_home(int** meipo) {
	static int boy = 19;
	*meipo = &boy;
}
void  boy_home2(int* &meipo) {
	static int boy = 20;
	meipo = &boy;
}


int main() {
	int x = 10, y = 100;
	swap(&x, &y);
	printf_s("x=%d,y=%d\n", x, y);

	int* meipo = NULL;
	boy_home2(meipo);
	printf_s("boy=%d\n", *meipo);


	system("pause");
	return 0;
}