C++起步

#include<iostream>
using namespace std;

const float pi=3.1415926;
float GetArea(float);

	int main(){

		cout<<"圆半径:";
		float r=0.0;
		cin>>r;
		float Area=GetArea(r);

		cout<<"面积:";
		cout<<Area<<endl;
		cout<<"\n";
		system("pause");
	}

	float GetArea(float r){
		return pi*r*r;
	}

 

备注：开始回温大学时期的C++，初始简单示例，输入圆半径，显示圆面积.