sl309.cpp

Visual C++ 的学习资料一

// sl309.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "iostream.h"
const double PI=3.1415926;

int main()
{
	int countarea(int n);
	int r;
	try
	{
		cout<<"输入一个1~7的整数："<<"\n";
		cin >>r;
		double area;
		area = PI*r*r;
		cout<<"求半径为"<<countarea(r)<<"的圆面积："<<"\n";
		cout<<"面积：area = "<<area<<"\n";
	}
	catch(...)
	{
		cout<<"发生异常！"<<"\n";
	}
}

int countarea(int n)
{
	if(n<1 || n>7)
	{
		throw "发生异常！";
	}
	return n;
}