#include<iostream>
using namespace std;
class money{
private:float r;
public:
float len(){return 2*3.14*r; }
float area(){return 3.14*r*r;}
money(float a){r=a; }
};
int main()
{
float x,sum1,sum2;
cout<<"游泳池的半径是:"<<endl;
cin>>x;
money A(x),B(x+3);
sum1=(A.len()+B.len())*35;
sum2=(B.area()-A.area())*20;
cout<<"围栏的造价是"<<sum1<<endl;
cout<<"过道的造价是"<<sum2<<endl;
return 0;
}
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