Java Program to Print the Left Triangle Star Pattern

JavaObject Oriented ProgrammingProgramming

In this article, we will understand how to print left 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 right triangle star pattern :
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *

Algorithm

Step 1 - START
Step 2 - Declare three integer values namely i, j 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 RightTriangle{
   public static void main(String args[]){
      int i, j, 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 rows : ");
      my_input = my_scanner.nextInt();
      System.out.println("The right triangle star pattern : ");
     for (i=0; i<my_input; i++){
        for (j=2*(my_input-i); j>=0; j--){
           System.out.print(" ");
        }
        for (j=0; j<=i; j++ ){
           System.out.print("* ");
        }
        System.out.println();
     }
   }
}

Output

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

Example 2

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

public class RightTriangle{
   public static void main(String args[]){
      int i, j, my_input;
      my_input = 8;
      System.out.println("The number of rows is defined as " +my_input);
      System.out.println("The right triangle star pattern : ");
      for (i=0; i<my_input; i++){
         for (j=2*(my_input-i); j>=0; j--){
            System.out.print(" ");
         }
         for (j=0; j<=i; j++ ){
            System.out.print("* ");
         }
         System.out.println();
      }
   }
}

Output

The number of rows is defined as 8
The right triangle star pattern :
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
raja
Updated on 22-Feb-2022 12:32:38

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