// chapter9.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#define PI 3.1415926

int main(int argc, char* argv[])
{
	printf("area is %f\n", 1.0*1.0*PI);
	//printf("area is %f\n", 1.0*1.0*3.1415926);



	return 0;
}