ProgBasicsJavaBook4.2ComplexConditions01OnTimeForTheExam

import java.util.Scanner;

public class E01OnTimeForTheExam {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int examHour = Integer.parseInt(scanner.nextLine());
        int examMins = Integer.parseInt(scanner.nextLine());
        int arrivalHour = Integer.parseInt(scanner.nextLine());
        int arrivalMin = Integer.parseInt(scanner.nextLine());

        String late = "late";
        String onTime = "On time";
        String early = "Early";

        int examTime = (examHour * 60) + examMins;
        int arrivalTime = (arrivalHour * 60) + arrivalMin;
        int totalMinDifference = arrivalTime - examTime;

        String studentArrival = late;
        if (totalMinDifference < -30) {
            studentArrival = early;
        } else if (totalMinDifference <= 0) {
            studentArrival = onTime;
        }

        String result = "";
        if (totalMinDifference != 0) {
            int hoursDifference = Math.abs(totalMinDifference / 60);
            int minsDifference = Math.abs(totalMinDifference % 60);

            if (hoursDifference > 0) {
                result = String.format("%d:%02d hours", hoursDifference,
                        minsDifference);
            } else {
                result = minsDifference + " minutes";
            }

            if (totalMinDifference < 0) {
                result += " before the start";
            } else {
                result += " after the start";
            }
        }

        System.out.println(studentArrival);
        if (!result.isEmpty()) {
            System.out.println(result);
        }
    }
}