Print Number Star Right Triangle Pattern Type2

PRINT PATTERN  7*8*9*10 4*5*6

For any input number N Print the following code – For below code N=4

7*8*9*10
4*5*6
2*3
1

PREREQUISITE:

Basic knowledge in Java programming, usage of loops.

ALGORITHM:

1. Take input from user i.e number of lines required (N value).
2. Take two loops one for each line (say ‘i’) and other for each digit in a particular line (say ‘j’). i starts from N and j starts from 1.
3. Take a result variable (say ‘a’) and initialize it with (i*(i-1))/2+1.
4. Here ‘i’ loop is used to access each line from n to 1 and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i value.
5. Print ‘a’ value along with * and post increment  until the j loop reaches a value less than i.
6. Print the final value ‘a’ of each line and go to next line.
7. Repeat the ‘i’ loop until it reaches 1.

CODE IN JAVA:

import java.lang.*;
import java.io.*;
class Main
{
    public static void main (String[]args) throws IOException
    {
        BufferedReader br =new BufferedReader (new InputStreamReader (System.in));
        int n, i, j, a = 0;
        System.out.print ("Enter the N value:");
        n = Integer.parseInt (br.readLine ());
    
        for (i = n; i >= 1; i--)
        {
	        a = (i * (i - 1)) / 2 + 1;
	        for (j = 1; j < i; j++)
	        {
	            System.out.print ((a++) + "*");
	        }
	        System.out.println (a++);
        }
    }
}

TAKING INPUT:

DISPLAYING OUTPUT: