/*--------------------------------------------------------------------*/ 
/*  This program computes the area of an ellipse with semiaxes a and b.         */ 
 
#include <iostream> 
using namespace std; 
 
const double PI = 3.141593; 
 
int main() 
{ 
   /*  Declare variables.  */ 
   double a, b, area; 
 
   /*  Enter the semiaxes of the ellipse.  */ 
   cout << "Enter the semiaxe a of the ellipse: "; 
   cin >> a;

   cout << "Enter the semiaxe b of the ellipse: ";
   cin >> b;

 
   /*  Compute the area of the ellipse.  */ 
   area = PI * a * b; 
 
   /*  Print the value of the area.  */ 
   cout << "The area of a ellipse with semiaxes " << a 
        << " and " << b << " is: " << area << endl; 
 
   /*  Exit program.  */ 
   return 0; 
} 
/*--------------------------------------------------------------------*/