Professor Estrada: Part 3 Homework Assignment

Intervals.java

package com.saurishsrivastava;
/** part 3: this program is used to take two time intervals and compare them with a series of calculations. */

/** import used packages */
import java.util.Scanner;

public class Intervals {
    /** Main method */
    public static void main(String[] args) {
        /** declare variables and initialize Scanner */
        Scanner input = new Scanner(System.in); // initialize the scanner
        int early_start; // variable for user early start
        int early_end; // variable for user early end
        int late_start; // variable for user late start
        int late_end; // variable for user late end
        int final_early_end; // variable for calculated early end in minutes
        int final_early_start; // variable for calculated early start in minutes
        int final_late_end; // variable for calculated late end in minutes
        int final_late_start; // variable for calculated late start in minutes
        int early_difference_minutes; // variable for calculated difference in early end and start in minutes
        int late_difference_minutes; // variable for calculated difference in late end and start in minutes

        /** Prompt user input */
        System.out.print("Enter earlier start and end time as two 24-hour format times: "); // ask for earlier start and end times
        early_start = input.nextInt(); // assign the first time to "early_start" variable
        early_end = input.nextInt(); // assign the second time to "early_end" variable
        System.out.print("Enter later start and end time as two 24-hour format times: "); // ask for later start and end times
        late_start = input.nextInt(); // assign the second time to "late_start" variable
        late_end = input.nextInt(); // assign the second time to "late_end" variable

        /** Calculations of Early Start and End (minutes) */
        final_early_end = (((early_end / 100) * 60) + early_end % 100); // calculates the number of minutes in the early end time
        final_early_start = (((early_start / 100) * 60) + early_start % 100); // calculates the number of minutes in the early start time
        early_difference_minutes = final_early_end - final_early_start; // takes the early difference in minutes - subtraction of bigger time and smaller time

        /** Calculations of Late Start and End (minutes) */
        final_late_end = (((late_end / 100) * 60) + late_end % 100); // calculates the number of minutes in the later end time
        final_late_start = (((late_start / 100) * 60) + late_start % 100); // calculates the number of minutes in the later start time
        late_difference_minutes = final_late_end - final_late_start; // takes the later difference in minutes - subtraction of bigger time and smaller time

        /**  ~Boolean methods~ */
        boolean isOverlap = (early_end > late_start || early_end > late_end); // used to determine if the intervals overlap
        boolean isLonger = (early_difference_minutes > late_difference_minutes); // used to determine which interval is longer

        /** ~Print intervals (minutes)~ */
        System.out.println("The earlier interval is " + early_difference_minutes + " minutes long."); // prints results
        System.out.println("The later interval is " + late_difference_minutes + " minutes long."); // prints results

        /** Print which interval is longer or equal */
        if (isLonger) {
            System.out.println("The earlier interval is longer.");
        } else if (!isLonger && early_difference_minutes == late_difference_minutes) {
            System.out.println("The intervals are equally long."); // the boolean needs to be false and both the minutes need to be the same for this to be true
        }
        else {
            System.out.println("The later interval is longer.");
        }

        /** Print if interval overlap */
        if (!isOverlap) {
            System.out.println("These intervals do not overlap.");
        }
        else {
            System.out.println("These intervals overlap.");
        }

    }
}