Program to Print Left Triangle Star Pattern in Java

Here following approach is used to print Left Triangle Star Pattern with a given number of rows.

• Use Scanner(System.in) class to enter the user input.
• This scanner.nextInt() only take int type input.
• Use first for loop to iterate each row, starting from first row to number of given row.
• Now second for loop to iterate each row and print the space(” “) in decreasing order.
• From third for loop, we print the number of stars in each row is equal to the row number.

import java.util.Scanner;

public class LeftStarPattern {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int numOfRow, i, j, k;
		System.out.println("enter the number of rows:- ");
		numOfRow = scanner.nextInt();
		for (i = 1; i <= numOfRow; i++) {
			for (j = (numOfRow - i); j >= 1; j--) {
				System.out.print(" ");
			}
			for (k = 1; k <= i; k++) {
				System.out.print("*");
			}
			System.out.println();
		}
		scanner.close();
	}
}

Output:-
enter the number of rows:
5
    *
   **
  ***
 ****
*****