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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4. // calcolo area e circonferenza del cerchio di raggio R dato in imput 
  5. double R;
  6. double area, circonferenza;
  7. const double PI= 3.14159;
  8.  
  9.  
  10. int main() {
  11.  
  12. 	cin>>R;
  13. 	area= PI*R*R; // area= PI*pow(R,2);
  14. 	circonferenza= 2*PI*R;
  15.  
  16. 	cout<<"area= "<<area<<endl;
  17. 	cout<<"circonferenza= "<<circonferenza<<endl;
  18.  
  19.  
  20.  
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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area= 38.4845
circonferenza= 21.9911
https://ideone.com/q50Xm1
language:
C++ (gcc 8.3)
created:
19 days ago
visibility:
public

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