// CSC 123/252 C# Assignment Part 2

// C# allows "operator overloading." Overloading is resolved at compile
// time, as the following program verifies: main prints True then False
// when it should have printed False then true, because it called the
// version of the overloads on static type "time" instead of
// dynamic type "Time".

// Your assignment: make these overloads use dynamic dispatch, so that
// the overloads will apply the correct algorithm depending on the
// dynamic type of a "time" object.  The Main function should print
// False then True. You may change both the time and Time classes but
// YOU MAY NOT CHANGE Main!!!

// There are elegant and inelegant ways to do this assignment.  The less
// code you write the better the solution.

// compile your program in Windows with csc opoverload.cs, or on
// Mono with mcs operoverload.cs, and run with mono operoverload.exe

using System;
class time {
  protected int mins, secs;
  public time(int m, int s) {
    mins = m + s/60;
    secs = s % 60;
  }//
  public override string ToString() { // overrides object.ToString
     return mins+"m"+secs+"s";
  }

  public static bool operator < (time a, time b) {
    return (a.mins*60+a.secs) < (b.mins*60+b.secs);
  }
  // must define < and > in pairs
  public static bool operator > (time a, time b) {
    return b < a;
  }
}//time

class Time : time {      // Time also has hours
  protected int hours;
  public Time(int h, int m, int s) : base(m,s) {
    hours = h + mins/60;
    mins = mins % 60;
  }
  public override string ToString() { // overrides object.ToString
     return hours+"h"+mins+"m"+secs+"s";
  }

  public static bool operator < (Time a, Time b) {
    return (a.hours*3600+a.mins*60+a.secs) < (b.hours*3600+b.mins*60+b.secs);
  }
  public static bool operator > (Time a, Time b) { 
    return b < a;
  }
}// Time

///////////////////////////// DO NOT TOUCH THE FOLLOWING!!!
public class opoverload {
  public static void Main() {
     time a = new Time(2,30,20);  // 2h30m20s
     time b = new Time(1,40,10);  // 1h40m10s
     time c = new time(50,30);    // 50m30s
     Console.WriteLine( a < b ); //?? true or false ??
     Console.WriteLine( c < b ); // ?? is it looking at the hours ??
  }  // DON'T TOUCH MAIN!
}