// Illustrates the use of const variable declarations, and also the tan() 
// function (as found in math.h).  What happens if you modify the program
// to include a line to change the value of PI?  Try it.

#include<iostream.h>
#include<math.h>

void main() {

  const double PI = 3.14159265;

  double angle_deg, angle_rad, side_1, side_2;

  cout << "Enter the angle in degrees: ";
  cin >> angle_deg;
  cout << "Enter the length of the adjacent side: ";
  cin >> side_1;

  angle_rad = angle_deg * PI/180;
  side_2 = side_1 * tan(angle_rad);
  cout << "The opposite side has length " << side_2 << ".\n";
}