Java Program for Triangle Star Pattern

May 28, 2020

Printing Triangle Star Pattern

In this problem we will be coding a Java Program for triangle star pattern which will have n number of stars in it rows and m number of stars in column hence it will be a n x m triangle star pattern. Pattern programming is a basic technique of programming which is followed by young programmers in order to master loops and learn their working.

Java Program for Triangle Star Pattern

Algorithm:

  • Take the number of rows as input from the user  and store it in any variable.(‘row‘ in this case).
  • Take the number of colas input from the user  and store it in any variable.(‘col‘ in this case).
  • Run a loop ‘row’ number of times to iterate through each of the rows. From i=0 to i<row. The loop should be structured as for (int i = 1; i <= row; i++)
  •  Run a nested loop inside the main loop to print the stars in each row of the triangle. From j=1 to j<=i. The loop should be structured as for (int i = 1; i <= row; i++)
  • In the nested loop print star System.out.print(“*”);.
  • In the main loop print a new line System.out.println();.

Code in Java:

import java.util.Scanner;
public class Pattern1 {

	public static void main(String[] args) {
     Scanner sc = new Scanner(System.in);
     System.out.println("Enter row ");
     int row = sc.nextInt();
    
     
     for (int i = 1; i <= row; i++) {
	     for (int j = 1; j <=i ; j++) 
			System.out.print("*");
	     System.out.println();
	 }
  }
}
This code is contributed by Shubham Nigam (Prepinsta Placement Cell Student)

One comment on “Java Program for Triangle Star Pattern”


  • Gyanendra

    import java.util.*;
    public class Main
    {
    public static void main(String[] args) {
    Scanner scn=new Scanner(System.in);

    int n=scn.nextInt();

    int k=1;

    while(k<=n){
    for(int i=1;i<=k;i++){
    System.out.print("* ");
    }
    System.out.println();
    k++;
    }

    }
    }