/*******************************************************************
  C201 Computer Programming II
  Fall 2006
  Dana Vrajitoru &

  A small program doing time conversions using enumerated types and
  structs.
********************************************************************/ 

#include <iostream>
#include <iomanip>
using namespace std;

// An enumeerated type defining the constants AM and PM for the
// standard time notation.
enum AMPM { AM, PM };

// A structure representing standard time.
struct Time_str {
  int hours, minutes;
  AMPM suffix;
};

// Prototypes.
void increment(Time_str &current);
void add(Time_str &current, int h, int m);
void convert(int military, Time_str &current);
void output(Time_str current);

int main()
{
  Time_str now;
  int military, hr, min;

  // Input-convert-output a time value.
  cout << "Enter a time value in military notation as 4 digits." 
       << endl;
  cin >> military;
  convert(military, now);
  cout << "The time you entered converts to standard notation as:" 
       << endl;
  output(now);

  // Increment the value by a given number of hours and minutes.
  cout << "We'll add a number of hours and minutes to this value"
       << endl << "Enter the hours" << endl;
  cin >> hr;
  cout << "Enter the minutes" << endl;
  cin >> min;
  add(now, hr, min);
  cout << "The result of the addition is:" << endl;
  output(now);

  return 0;
}

// Increments the current time by one minute.
// To be completed by the student.
void increment(Time_str &current)
{
  if (current.minutes < 59)
    current.minutes++;
  else {
    // To be completed by the student.
    current.minutes = 0;
    // Update the hours and the suffix.
  } 
}

// Adds a number of hours and minutes to the current time.
// It should call the function increment a number of times equal to
// the number of minutes plus 60 times the number of hours.
// To be completed by the student. 
void add(Time_str &current, int h, int m)
{
}

// Converts the time from military notation to standard notation.
// To be completed by the student.
void convert(int military, Time_str &current)
{
  current.minutes = military % 100;
  int military_hr = military/100;
  if (military_hr == 0) {
    current.hours = 12;
    current.suffix = AM;
  }
  // This part must be completed by the student.
  else {
    // Some default values to be able to compile.
    current.hours = 0;
    current.suffix = AM;
  }
}

// Outputs the current time.
void output(Time_str current)
{
  cout << current.hours << ":" << setw(2) << setfill('0') 
       << current.minutes << ' ';
  if (current.suffix == AM)
    cout << "am" << endl;
  else
    cout << "pm" << endl;
}

/******************* Example of output ***************
Enter a time value in military notation as 4 digits.
0015
The time you entered converts to standard notation as:
12:15 am
We'll add a number of hours and minutes to this value
Enter the hours
1
Enter the minutes
12
The result of the addition is:
12:15 am
*******************************************************/