#include <iostream>
#include "glob.h"

// function  prototype
double cvt_feet_to_meters(double feet);
double cvt_meters_to_feet(double meters);
void prob_01();
void prob_02();
void prob_03();

int main()
{
  std::cout << "c++ output\n";  /* c++ output - stdout */
  std::cout << "c++ output chapter 1\n"; 
  prob_01();
  prob_02();
  prob_03();
}

void prob_01()
{
  double my_height_meters;
  double my_height_feet;
  
  std::cout << "Problem 1\n";
  std::cin >> my_height_feet;  // read height - c++ input from stdin
  my_height_meters = cvt_feet_to_meters(my_height_feet); // convert units
  std::cout << "My height in feet = " << my_height_feet << "\n"; 
  std::cout << "My_height_meters = " << my_height_meters << "\n";
}

void prob_02()
{
  double diff_meters;
  double diff_yards;
  
  diff_meters = 100.0 - cvt_feet_to_meters(100.0 * 3.0);
  diff_yards = cvt_meters_to_feet(diff_meters) / 3.0;

  std::cout << "Problem 2\n";
  std::cout << "100 meters is longer than 100 yards by " << diff_meters << " meters or " << diff_yards << " yards\n";
}

void prob_03()
{
  std::cout << "Problem 3\n";
  std::cout << "300 kilometers = " << 300.0 * miles_per_kilometer << " miles\n";
}

double cvt_feet_to_meters(double feet)
{
  double meters;

  meters = feet * meter_per_foot;
  return meters;
}

double cvt_meters_to_feet(double meters)
{
  double feet;

  feet = meters * feet_per_meter;
  return feet;
}