北極星的宇宙

#include <iostream>
using namespace std;
class shape {
  public: 
    shape() { 
      height = 0 ;
      width = 0 ;
      length = 0 ;
      radius  = 0;
    };
    double area() ;
    int area(int w, int h) ;
    double area(int radius) ;
   protected:
    int height ;
    int width ;
    int length ;
    int radius ;
    
};

class square : public shape {
  public : 
 square(){
 int w;
      cout<<"請輸入邊長"<<endl;
      cin>>w;
      width = w ;
  };
    int area() {
      
      return width * width ;
    };
     
} ;
class rectangle : public shape {
    public : 
 rectangle (){
 int w;
 int h;
      cout<<"請輸入寬"<<endl;
      cin>>w;
      cout<<"請輸入高"<<endl;
      cin>>h;
      height = h ;
      width = w ;

  };
    int area() {
      
      return height * width ;
    };
} ;

class circle : public shape {
     public : 
 circle (){
 int r;
      cout<<"請輸入半徑"<<endl;
      cin>>r;
      radius=r;

  };
    double area() {
      
      return 3.14159*radius*radius ;
    };
} ;

class Right_triangle : public shape {
     public : 
 Right_triangle (){
 int w;
 int h;
      cout<<"請輸入寬"<<endl;
      cin>>w;
      cout<<"請輸入高"<<endl;
      cin>>h;
      height = h ;
      width = w ;
  };
    double area() {
      
      return height*width/2 ;
    };
} ;

class rectangle_column : public shape {
    public : 
 rectangle_column (){
 int w;
 int h;
 int l;
      cout<<"請輸入寬"<<endl;
      cin>>w;
      cout<<"請輸入長"<<endl;
      cin>>h;
      height = h ;
      width = w ;
      cout<<"請輸入高"<<endl;
      cin>>l;
      length=l;

  };
    int area() {
      
      return height * width*length ;
    };
} ;

class circle_column : public shape {
     public : 
 circle_column (){
 int r;
 int l;
      cout<<"請輸入半徑"<<endl;
      cin>>r;
      radius=r;
      cout<<"請輸入高"<<endl;
      cin>>l;
      length=l;


  };
    double area() {
      
      return 3.14159*radius*radius*length ;
    };
} ;


class Right_triangle_column : public shape {
     public : 
 Right_triangle_column (){
 int w;
 int h;
 int l;
      cout<<"請輸入寬"<<endl;
      cin>>w;
      cout<<"請輸入高"<<endl;
      cin>>h;
      height = h ;
      width = w ;
      cout<<"請輸入高"<<endl;
      cin>>l;
      length=l;
  };
    int area() {
      
      return height*width/2*length ;
    };
} ;

class square_column : public shape {
  public : 
 square_column(){
 int w;
 int l;
      cout<<"請輸入邊長"<<endl;
      cin>>w;
      cout<<"請輸入高"<<endl;
      cin>>l;
      width = w ;
      length=l;
  };
    int area() {
      
      return width * width*length ;
    };
     
} ;




int main(void) {
 int q;
  cout<<"請問要算甚麼面積"<<endl<<"正方形請輸入 1 "<<endl<<"長方形請輸入 2 "<<endl<<"圓請輸入 3 "<<endl<<"直角三角形請輸入 4 "<<endl<<"正方形柱請輸入 5 "<<endl<<"長方形柱請輸入 6 "<<endl<<"圓柱請輸入 7 "<<endl<<"直角三角形柱請輸入 8 "<<endl;
  cin>>q;
if(q==1){
square s ;
cout << "正方形面積為="  << s.area() << endl ;}
if(q==2){
rectangle r ;
cout << "長方形面積為="  << r.area() << endl ;}
if(q==3){
 circle c ;
 cout << "圓面積為="  << c.area() << endl ;}
 if(q==4){
 Right_triangle rt ;
 cout << "直角三角形面積為="  << rt.area() << endl ;}
 if(q==5){
   square_column sc;
   cout << "正方形柱體積為="  << sc.area() << endl ;
 }
if(q==6){
rectangle_column rc ;
cout << "長方形柱體積為="  << rc.area() << endl ;}
if(q==7){
 circle_column cc ;
 cout << "圓柱體積為="  << cc.area() << endl ;}
 if(q==8){
 Right_triangle_column rtc ;
cout << "直角三角形柱體積為="  << rtc.area() << endl ;
 return 0;}
}