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

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