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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. class Equal {
  7.     protected:
  8.     int a;
  9.     public:
  10.     	Equal(int x):a(x){}
  11.     int perim() {
  12.         return 3*a;
  13.     }
  14.     double square() {
  15.         return ((a*a)*sqrt(3))/4;
  16.     }
  17. };
  18.  
  19. int main() {
  20. 	int n;
  21. 	cin >> n;
  22.     Equal eq(n);
  23.     cout<<eq.perim()<<" ";
  24.     cout<<fixed<<setprecision(4)<<eq.square();
  25. }
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/fHlpJA
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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