这里边POWER是izenme运算的？求解释，谢谢！
// 1.cpp : Defines the entry point for the console application.//
#include "stdafx.h"
#define POWER(x) (x*x)
int main(int argc, char* argv[])
{
int i=4;
printf("%d\n",POWER(i-2));
printf("Hello World!\n");
return 0;
}
