计算图形面积

[c++]代码库

#include "stdafx.h"
#include"iostream"
using namespace std;
const double pi = 3.14;
int main()
{
	cout << "Input shape" << endl;
	cout << "if circle, input c, if rectangle input r; if square input s" << endl;
	char shape;
	cin >> shape;
	switch (shape)
	{
	case 'c': double r;
		cout << "input radius" << endl;
		cin >> r;
		cout << " circle area=" << r*r*pi << endl;
		break;
	case 'r': double len, wid;
		cout << "input length and width" << endl;
		cin >> len >> wid;
		cout << "rectangel=" << (len + wid) * 2 << endl;//补充矩形面积计算
		break;
	case 's':cout << "input length" << endl;
		cin >> len;
		cout << "square=" << len*len<< endl;//补充正方形面积计算
		break;
	default: cout << "input error!" << endl;
		break;
	}
	return 0;
}