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Given a time in numbers we can convert it into words. For example : 5 : 00 —— five o’clock 5 : 10 —— ten minutes past five 5 : 15 —— quarter past five 5 : 30 —— half past five 5 : 40 —— twenty minutes to six 5 : 45 —— quarter to six 5 : 47 —— thirteen minutes to six Write a program which first inputs two integers, the first between 1 and 12 (both inclusive) and second between 0 and 59 (both inclusive) and then prints out the time they represent, in words. 

import java.util.*;

public class TimeToWord {
    int h, m;
    String[] N = {
            "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven",
            "Twelve", "Thirteen", "FourTeen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen", "Twenty",
            "Twenty One", "Twenty Two", "Twenty Three", "Twenty Four", "Twenty Five", "Twenty Six",
            "Twenty Seven", "Twenty Eight", "Twenty Nine"
    };

    TimeToWord(int hr, int min) {
        h = hr;
        m = min;
    }

    String getName() {
        if (m == 0)
            return String.format("%s o'clock", N[h - 1]);
        else if (m == 15)
            return String.format("Quarter past %s", N[h - 1]);
        else if (m == 30)
            return String.format("Half past %s", N[h - 1]);
        else if (m == 45)
            return String.format("Quarter to %s", N[h]);
        else if (m < 30)
            return String.format("%s minutes past %s", N[m - 1], N[h - 1]);
        else
            return String.format("%s minutes to %s", N[60 - m - 1], N[h]);
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter Time as hr,min :");
        String time = sc.next().trim();
        int ind = time.indexOf(',');
        int hr = Integer.parseInt(time.substring(0, ind));
        int min = Integer.parseInt(time.substring(ind + 1));
        System.out.printf("%d:%d  %s", hr, min, (new TimeToWord(hr, min)).getName());
        sc.close();
    }
}

Algorithm

void main()

  1. Initialize the Scanner object to take input.
  2. Take a String input of time in the format of "hour,minute" into a String varaible time
  3. Declare ind=time.indexOf(","), to store the index of ',' in the sytring.
  4. hr(hours) is parsed integer of substring of time from 0 to ind
  5. min(minutes) is parsed integer of substring of time from ind to end
  6. Create a object of class TimeToWord by passing hr, min as constructor parameters and then call the method getName() to print the time in words.

String getName()

  1. if minutes is 0 then return time in format " o'clock"
  2. else if minutes in 15 then return time in format "Quarter past "
  3. else if minutes in 30 then return time in format "Half past "
  4. else if minutes is 45 then return time in format "Quarter to "
  5. else if minutes are smaller than 30 then return time in format " minutes past "
  6. else return time in format "<60-minutes> minutes to "

Variable Description

Name Type Use
global
h int to store hours
m int to store minutes
N String[] Name of numbers from 1 to 29 in a array
void main()
sc Scanner object used to take user input
time String to store entered time
ind int stores index of ',' in 'time'
hr int parsed integer of substring of time from 0 to ind (hours)
min int parsed integer of substring of time from ind+1 to end (minutes)