Print Right Triangle Number Pattern Type 2

September 23, 2021

PRINT PATTERN  10987 456 32 1

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

10987
456
32
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 for even row and by (i*(i-1))/2+1 for Odd row in the pattern.
  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  and post decrement  until the j loop reaches a value equal i.
  6. 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;
        System.out.print ("Enter N value:");
        n = Integer.parseInt (br.readLine ());
        
        for (i = n; i >= 1; i--)
        {
	        if (i % 2 == 0)
	        {
	            a = (i * (i + 1)) / 2;
	            for (j = 1; j <= i; j++)
	            {
		            System.out.print (a--);
	            }
	        }
	        else
	        {
	            a = (i * (i - 1)) / 2 + 1;
	            for(j = 1; j <= i; j++)
	            {
		            System.out.print (a++);
	            }
	        }
	        System.out.println ();
        }
    }
}

 

TAKING INPUT:

DISPLAYING OUTPUT:

5 comments on “Print Right Triangle Number Pattern Type 2”


  • manicampusplacements

    import java.util.*;
    public class Main{
    public static void main(String[] args){
    int n = new Scanner(System.in).nextInt();
    int count = ((n+1)*n)/2;
    for(int i=n;i>=1;i–){
    for(int j=1;j<=i;j++){
    System.out.print(count);
    count–;
    }
    System.out.println();
    }
    }
    }

    0

  • Raghvendra Singh

    import java.util.Scanner;
    public class right {

    public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    System.out.println(“Enter count: “); //input one plus value what you want to print like 11,15 etc.
    int count=sc.nextInt();
    System.out.println(“Enter n: “);// input number of rows.
    int n=sc.nextInt();
    for(int i=1;i<=n;i++)
    {
    for(int j=i;j<=n;j++) {
    –count;
    System.out.print(count);
    }
    System.out.println();
    }

    }
    }

    1

  • Swarnali

    import java.util.Scanner;
    public class Main {

    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int count=0;
    System.out.println(“Enter row”);
    int row = sc.nextInt();

    for (int i = 1; i <= row; i++) {
    for (int j = 1; j <= i; j++) {
    count++;

    }}
    for (int i = 1; i =i; j–) {
    System.out.print(count);
    count–;

    }
    System.out.println(“”);

    }
    }
    }

    1

  • Swarnali

    import java.util.Scanner;
    public class SwarnaliBhattacharjee {

    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int count=0;
    System.out.println(“Enter row”);
    int row = sc.nextInt();

    for (int i = 1; i <= row; i++) {
    for (int j = 1; j <= i; j++) {
    count++;

    }}
    for (int i = 1; i =i; j–) {
    System.out.print(count);
    count–;

    }
    System.out.println(“”);

    }
    }
    }

    0

  • Shubham

    class JavaApplication9
    {
    public static void main(String[] args)
    {
    Scanner obj = new Scanner(System.in);
    int a,c=0;
    a = obj.nextInt();
    if(a%2==0)
    {
    c = (a*(a+1))/2;
    }
    else
    {
    c = (a*(a-1))/2 + a;
    }
    for(int i=a;i>=1;i–)
    {
    for(int j=1;j<=i;j++)
    {
    System.out.print(c);
    c=c-1;
    }
    System.out.println();
    }

    }
    }

    0