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实验内容

设置圆半径r=2.5，圆柱h=4，求圆的周长、圆面积、圆球体积、圆柱体积。用cin输入要计算的项目，输入输出均要有文字提示

#include <iostream>
#include <string.h>
using namespace std;

int main() {
	const double PI = 3.14159265;
	double r=2.5, h=4.0, dResult;
	int nID;
	while(1) {
		cout<<"1-计算圆周长"<<endl;
		cout<<"2-计算圆面积"<<endl;
		cout<<"3-计算圆球体积"<<endl;
		cout<<"4-计算圆柱体积"<<endl;
		cout<<"5-退出"<<endl;
		cout<<"请选择命令号1-5"<<endl;
		cin>>nID;
		if(nID == 5) break;
		else {
			switch(nID) {
				case 1:
					dResult = PI*r*2.0;
					cout<<"圆周长为："<<dResult<<endl;
					break;
				case 2:
					dResult = PI*r*r;
					cout<<"圆面积为："<<dResult<<endl;
					break;
				case 3:
					dResult = PI*r*r*r*4.0/3.0;
					cout<<"圆球体积为："<<dResult<<endl;
					break;
				case 4:
					dResult = PI*r*r*h;
					cout<<"圆柱体积为："<<dResult<<endl;
					break;
				default:
					cout<<"选择的命令号不对！"<<endl;
					break;
	
			}
			cout<<"按Enter键继续……";
			cin.get();
			cin.get();
			system("cls");
		}
	}
	return 0;
	
}

实验结果