Java Program to Convert Number to Words

Let us see how to convert number to word.

single digit: A digit or symbol starts with {0,1,2,3,4,5,6,7,8,9}.

Two digit:A digit or symbol starts with {10,11,12.....99}

multiples of ten+single digit=remaining all the two digit numbers.

as we know that the number ends with zero are multiples of ten.

Java Code for Number to Word Conversion

import java.util.Scanner;
class Solution {
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		System.out.println("enter the number");
		int n=sc.nextInt();
		int n1=n,n2=n;
		int b=n1%10,a=n2/10; //  n1/10 means last digit is removed and n2%10 means last digit by modulus

		String[] single_digits = new String[]{"zero","one","two","three","four","five", "six","seven","eight","nine"};
		String[] two_digits = new String[]{"","ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen", "nineteen"};
		String[] tens_multiple = new String[]{"","","twenty","thirty","forty","fifty","sixty", "seventy","eighty","ninety"};
		if(a==1)
		{
			System.out.println(two_digits[b+1]);
		}
		else if(b==0)
			System.out.println(tens_multiple[a]);
		else
			System.out.println(tens_multiple[a]+"-"+single_digits[b]);
	}//main
}

enter the number

3
-three

45
forty-five

90
ninety