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  1. #include <iostream>
  2. #include <cmath> // for M_PI constant
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.   float radius, area;
  8.  
  9.   cout << "Enter the radius of the circle: ";
  10.   cin >> radius;
  11.  
  12.   // Use M_PI from cmath for a more precise value
  13.   area = M_PI * pow(radius, 2.0);
  14.  
  15.   cout << "Area of the circle with radius " << radius << " is " << area << endl;
  16.  
  17.   return 0;
  18. }
Success #stdin #stdout 0s 5304KB
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Standard input is empty
stdout
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Enter the radius of the circle: Area of the circle with radius 4.59163e-41 is 0
https://ideone.com/1Rlfco
language:
C++14 (gcc 8.3)
created:
30 days ago
visibility:
public

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