Java Program to Print Downward Triangle Star Pattern


In this article, we will understand how to print downward triangle star pattern. The pattern is formed by using multiple for-loops and print statements.

Below is a demonstration of the same −

Input

Suppose our input is −

Enter the number of rows : 8

Output

The desired output would be −

The downward triangle star pattern :
* * * * * * * *
* * * * * * *
 * * * * * *
  * * * * *
   * * * *
    * * *
     * *
      *

Algorithm

Step 1 - START
Step 2 - Declare four integer values namely i, j,k and my_input
Step 3 - Read the required values from the user/ define the values
Step 4 - We iterate through two nested 'for' loops to get space between the characters.
Step 5 - After iterating through the innermost loop, we iterate through another 'for' loop. This will help print the required character.
Step 6 - Now, print a newline to get the specific number of characters in the subsequent lines.
Step 7 - Display the result
Step 8 - Stop

Example 1

Here, the input is being entered by the user based on a prompt. You can try this example live in our coding ground tool run button.

import java.util.Scanner;
public class DownwardTriangle{
   public static void main(String args[]){
      int i, j, k, my_input;
      System.out.println("Required packages have been imported");
      Scanner my_scanner = new Scanner(System.in);
      System.out.println("A reader object has been defined ");
      System.out.print("Enter the number of my_input : ");
      my_input = my_scanner.nextInt();
      System.out.println("The downward triangle star pattern : ");
      for ( i= 0; i<= my_input-1; i++){
         for ( j=0; j<=i; j++){
            System.out.print(" ");
         }
         for ( k=0; k<=my_input-1-i; k++){
            System.out.print("*" + " ");
         }
         System.out.println();
      }
   }
}

Output

Required packages have been imported
A reader object has been defined
Enter the number of my_input : 8
The downward triangle star pattern :
* * * * * * * *
 * * * * * * *
  * * * * * *
   * * * * *
    * * * *
     * * *
      * *
       *

Example 2

Here, the integer has been previously defined, and its value is accessed and displayed on the console.

public class DownwardTriangle{
   public static void main(String args[]){
      int i, j, k, my_input;
      my_input = 8;
      System.out.println("The number of rows is defined as " +my_input);
      System.out.println("The downward triangle star pattern : ");
      for ( i= 0; i<= my_input-1; i++){
         for ( j=0; j<=i; j++){
            System.out.print(" ");
         }
         for ( k=0; k<=my_input-1-i; k++){
            System.out.print("*" + " ");
         }
         System.out.println();
      }
   }
}

Output

The number of rows is defined as 8
The downward triangle star pattern :
* * * * * * * *
 * * * * * * *
  * * * * * *
   * * * * *
    * * * *
     * * *
      * *
       *

Updated on: 25-Feb-2022

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