#include<iostream>
using namespace std;

// Pre-condition: Positive dollar-and-cents amount entered
// Post-condition: Return 15% tip
float findTip(float amoutDue);


int main()
{
 float amountDue;

 // Print exactly two places after the decimal point
 // for money (as in earlier labs)
 cout.setf(ios::fixed);
 cout.setf(ios::showpoint);
 cout.precision(2);

 // Get money amount from user
 cout << "How much is due? ";
 cin >> amountDue;

 // Compute and report tip
 cout << "The tip is " << findTip(amountDue)
      << endl;

 return 0;
}


// Compute tip
float findTip(float amountDue)
{
 return amountDue*.15;
}