#include<iostream>
using namespace std;
const double pi=3.14; //定义常量pi
class yuan{
private:
int radius;
public:
void banjing(int banjing);
void show();
}; //注意要有分号
void yuan::banjing(int banjing){
radius=banjing;
}
void yuan::show(){
cout<<"周长为:"<<2*radius*pi<<endl;
cout<<"面积为:"<<radius*radius*pi<<endl;
}
void main(){
yuan myyuan;
myyuan.banjing(5); //调用yuan类,同时把值5赋给radius
myyuan.show();
}
using namespace std;
const double pi=3.14; //定义常量pi
class yuan{
private:
int radius;
public:
void banjing(int banjing);
void show();
}; //注意要有分号
void yuan::banjing(int banjing){
radius=banjing;
}
void yuan::show(){
cout<<"周长为:"<<2*radius*pi<<endl;
cout<<"面积为:"<<radius*radius*pi<<endl;
}
void main(){
yuan myyuan;
myyuan.banjing(5); //调用yuan类,同时把值5赋给radius
myyuan.show();
}