PBE-Coding101Exam-6March2016-OnTimeForTheExam_AngelKalinkov

using System;

class OnTimeForTheExam
{
    static void Main(string[] args)
    {
        byte examHour = byte.Parse(Console.ReadLine());
        byte examMinutes = byte.Parse(Console.ReadLine());
        byte arriveHour = byte.Parse(Console.ReadLine());
        byte arriveMinutes = byte.Parse(Console.ReadLine());

        String late = "Late";
        String onTime = "On time";
        String early = "Early";
        int examTimeToMin = examHour * 60 + examMinutes;
        int arriveTimeToMin = arriveHour * 60 + arriveMinutes;
        int difference = arriveTimeToMin - examTimeToMin;

        String studentArrival = late;
        if (difference < -30)
        {
            studentArrival = early;
        }
        else if (difference <= 0)
        {
            studentArrival = onTime;
        }
        String result = "";
        if (difference != 0)
        {
            int hoursDifference = Math.Abs(difference / 60);
            int minutesDifference = Math.Abs(difference % 60);
            if (hoursDifference > 0)
            {
                result = ($"{hoursDifference}:{minutesDifference:D2} hours");
            }
            else
            {
                result = minutesDifference + " minutes";
            }
            if (difference < 0)
            {
                result += " before the start";
            }
            else
            {
                result += " after the start";
            }
        }
        Console.WriteLine(studentArrival);
        if (result != null)
        {
            Console.WriteLine(result);
        }
    }
}