Java: Display the pattern like right angle triangle with a number

Last update on March 11 2025 11:02:57 (UTC/GMT +8 hours)

Right-Angle Triangle Number Pattern

Write a Java program to display the pattern like a right angle triangle with a number.

Test Data
Input number of rows : 10

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise16 {

   public static void main(String[] args)

{
   int i,j,n;
   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(j);

    System.out.println("");
    }
}
}

Sample Output:

Input number of rows : 10                                                                                     
1                                                                                                       
12                                                                                                       
123                                                                                                       
1234                                                                                                       
12345                                                                                                       
123456                                                                                                       
1234567                                                                                                       
12345678                                                                                                      
123456789                                                                                                     
12345678910  

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to generate a right-angle triangle pattern of numbers using recursion for each row.
• Write a Java program to print a right-angle triangle where each row’s numbers are in descending order.
• Write a Java program to create a right-angle triangle number pattern where each row is the reverse of the previous row.
• Write a Java program to generate a triangle pattern with each row starting at the row number and incrementing by 2.

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a program in Java to display the n terms of odd natural number and their sum.
Next: Write a program in Java to print such a pattern like right angle triangle with a number which will repeat a number in a row.