Java Program to Print Triangle of Numbers in Reverse Pattern

Write a Java program to print triangle of numbers in reverse pattern using for loop.

package Shapes3;

import java.util.Scanner;

public class TriangleNumRev1 {

	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Triangle of Numbers in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Triangle of Numbers in Reverse Order Pattern");
		
		for (int i = rows; i >= 1; i-- ) 
		{
			for (int j = 1; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(int k = i; k <= rows; k++) 
			{
				System.out.print(k + " ");
			}
			System.out.println();
		}
	}
}
Java Program to Print Triangle of Numbers in Reverse Pattern

This program prints the triangle pattern of numbers in descending order or reverse order using while loop. For more numeric patterns, refer to the Java Number Pattern Programs article.

package Shapes3;

import java.util.Scanner;

public class TriangleNumRev2 {

	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Triangle of Numbers in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Triangle of Numbers in Reverse Order Pattern");
		int j, k, i = rows;
		
		while(i >= 1 ) 
		{
			j = 1; 
			while(j < i) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while(k <= rows) 
			{
				System.out.print(k + " ");
				k++;
			}
			
			System.out.println();
			i--;
		}
	}
}
Enter Triangle of Numbers in Reverse Rows = 9
Triangle of Numbers in Reverse Order Pattern
        9 
       8 9 
      7 8 9 
     6 7 8 9 
    5 6 7 8 9 
   4 5 6 7 8 9 
  3 4 5 6 7 8 9 
 2 3 4 5 6 7 8 9 
1 2 3 4 5 6 7 8 9

This Java example uses the do while loop to display the reverse order or descending order numbers in triangle pattern.

package Shapes3;

import java.util.Scanner;

public class TriangleNumRev3 {

	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Triangle of Numbers in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Triangle of Numbers in Reverse Order Pattern");
		int j, k, i = rows;
		
		do
		{
			j = 1; 
			do 
			{
				System.out.print(" ");

			} while(j++ < i);
			
			k = i;
			do 
			{
				System.out.print(k + " ");

			} while(++k <= rows);
			
			System.out.println();

		} while(--i >= 1 ) ;
	}
}
Enter Triangle of Numbers in Reverse Rows = 5
Triangle of Numbers in Reverse Order Pattern
     5 
    4 5 
   3 4 5 
  2 3 4 5 
 1 2 3 4 5

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