lab2_3.cpp

简单的数据处理

#include <iostream>
using namespace std;
 

void main()
{   int iType;
    float PI=3.1416;
	float radius,a,b,area;
	cout<<"图形类型为？（1-圆形,2-长方形,3-正方形):";
		cin>>iType;
	switch(iType)
	{
	case 1: cout<<"圆的半径为：";
				cin>>radius;
		area=PI*radius*radius;
		cout<< "面积为："<<area<<endl;
		 
		break;
    case 2: cout<<"长为：";
				cin>>a;
		    cout<<"宽为：";
				cin>>b;
		area=a*b;
		cout<< "面积为："<<area<<endl;  
		
		break;
	case 3: cout<<"正方形的边长为：";
				cin>>a;
		area=a*a;
		cout<< "面积为："<<area<<endl;  
		
		break;
	default:
		cout<<"请按照要求输入！"<<endl;
	}
}