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  1. #include <iostream>
  2. #define PI 3.14159
  3.  
  4. using namespace std;
  5.  
  6. class Circle{
  7. private:
  8.     float radius;   
  9. public:
  10.     float *getRadiusPtr(){  
  11.         return &radius;
  12.    }
  13.     void getRadius();
  14.     void showRadius();
  15.     float area(float*);
  16.  
  17. };
  18. void Circle::getRadius() {
  19.     cout << "Enter Radius: "<< endl;
  20.     cin >> radius;
  21. }
  22.  
  23. void Circle::showRadius(){
  24.          cout << "Radius: " << endl;
  25.     }
  26.  
  27. int main(){
  28.     Circle c1;
  29.     c1.getRadius();
  30.     float *r = c1.getRadiusPtr();
  31.     c1.showRadius();
  32.     cout << "r= " << *r << endl;
  33.     float a = PI * *r * *r; 
  34.     cout << "Area: " << a << endl;
  35.  
  36.     return 0;
  37. }
Success #stdin #stdout 0s 3472KB
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stdin
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10
stdout
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Enter Radius: 
Radius: 
r= 10
Area: 314.159
https://ideone.com/z9Hvx9
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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