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();
}
}
}```

This Java program prints the triangle pattern of numbers in descending order or reverse order using while loop.

```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 ``````