// c01a.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <iostream.h>
#include <math.h>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

double Cylinder( double r, double h );
double Sphere( double r );
double Rectangle( double l, double w, double h );

int main(int argc, char* argv[])
{
	double radius, height;
	cout << "請輸入圓柱體的半徑和高：\n";
	cin >> radius >> height;
	double volume = Cylinder( radius, height );
	cout << "該圓柱體的體積為：" << volume << endl;

	cout << "請輸入球半徑：\n";
	cin >> radius;
	double areaOfSphere = Sphere( radius );
	cout << "該球面的面積為：" << areaOfSphere << endl;

	double length, width;
	cout << "請輸入長方體的長、寬、高：\n";
	cin >> length >> width >> height;
	volume = Rectangle( length, width, height );
	cout << "該長方體的體積為：" << volume << endl;

	return 0;
}

double Cylinder( double r, double h )
{
	return r * r * M_PI * h;
}

double Sphere( double r )
{
	return 4 * r * r * M_PI;
}

double Rectangle( double l, double w, double h )
{
	return l * w * h;
}