Java: Print a pattern like right angle triangle with number increased by 1

Last update on May 14 2025 13:00:33 (UTC/GMT +8 hours)

Right-Angle Triangle with Incrementing Numbers

Write a Java program to make such a pattern like a right angle triangle with the number increased by 1.

The pattern like :

1
2 3
4 5 6
7 8 9 10 

Test Data
Input number of rows : 4

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise18 {

  public static void main(String[] args)

{
   		int i,j,n,k=1;

   		System.out.print("Input number of rows : ");

   		Scanner in = new Scanner(System.in);
		    n = in.nextInt();

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

Sample Output:

Input number of rows : 4                                                                                      
1                                                                                                       
23                                                                                                       
456                                                                                                       
78910 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to generate a right-angle triangle with sequential numbers starting from a user-defined offset.
• Write a Java program to print a right-angle triangle where each row contains consecutive numbers using nested loops.
• Write a Java program to create a right-angle triangle with incrementing numbers using recursion and a global counter.
• Write a Java program to build a right-angle triangle with incrementing numbers and then display the sum of all numbers in the triangle.

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