#include<iostream>
using namespace std;
int rectangle area(int x,int y);
float cirlce area(int r);
const float PI=3.14

int main()
{    int a,b,c;

 cout<<"请输入圆的半径："<<a<<endl;
 cout<<"请输入长方形长："<<b<<"宽:"<<c<<endl;
 float circle area();
 double rectangle area();
cout<<"圆的面积为："<<circle area<<endl;
cout<<"长方形面积为:"<<rectangle area<<endl;
}
float circle area(int r)
{   return PI*r*r;}
int rectangle(int x,int y)
{  return x*y;}