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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class shape
  5. {
  6. public:
  7.     shape()
  8.     {
  9.         cout<<"shape constructed"<<endl;
  10.     }
  11.     virtual double getarea()
  12.     {
  13.         return 0;
  14.     }
  15.     virtual ~shape()
  16.     {
  17.         cout<< "shape destroyed"<<endl;
  18.     }
  19. };
  20.  
  21. class circle:public shape
  22. {
  23.     int rad;
  24. public:
  25.     circle(int r)
  26.     {
  27.         rad=r;
  28.         cout<< "circle constructed"<<endl;
  29.     }
  30.     double getarea()
  31.     {
  32.         double ar=3.14*rad*rad;
  33.         //cout<< "circle area: "<<ar<<endl;
  34.         return ar;
  35.     }
  36.     ~circle()
  37.     {
  38.         cout<< "circle destroyed"<<endl;
  39.     }
  40. };
  41.  
  42. class rect:public shape
  43. {
  44.     int b,h;
  45. public:
  46.     rect(int bs,int ht)
  47.     {
  48.         b=bs;
  49.         h=ht;
  50.         cout<< "rectangle constructed"<<endl;
  51.     }
  52.     double getarea()
  53.     {
  54.         double ar=b*h;
  55.         //cout<< "rect area: "<<ar<<endl;
  56.         return ar;
  57.     }
  58.     ~rect()
  59.     {
  60.         cout<< "rectangle destroyed"<<endl;
  61.     }
  62. };
  63.  
  64. int main()
  65. {
  66.     int r;
  67.     cout<< "radius: ";
  68.     cin>>r;
  69.  
  70.     shape *s1=new circle(r);
  71.  
  72.     int a,b;
  73.     cout<< "base and height: ";
  74.     cin>>a>>b;
  75.     shape *s2=new rect(a,b);
  76.  
  77.    cout<<"rect: "<< s2->getarea()<<endl;
  78.    cout<< "circle: "<<s1->getarea()<<endl;
  79.     delete s1;
  80.  
  81.  
  82.     delete s2;
  83.  
  84.  
  85. }
  86.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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radius: shape constructed
circle constructed
base and height: shape constructed
rectangle constructed
rect: 1.50874e+09
circle: 0
circle destroyed
shape destroyed
rectangle destroyed
shape destroyed
https://ideone.com/PGLLVE
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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