Java program to print number star right triangle pattern type 1

June 4, 2020

Print number star right triangle pattern type 1

Take input from user i.e number of lines required (N value).Take two loops one for each line (say ‘i’) and other for each digit in a particular line (say ‘j’). i starts from 1 and j starts from 1.Take a result variable (say ‘a’) and initialize it with 1.Here ‘i’ loop is used to access each line from 1 to n and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i value.Print ‘a’ value along with * and post increment until the j loop reaches a value less than i.Print the final value ‘a’ of each line and go to next line.Repeat the ‘i’ loop until it reaches n.

Algorithm

Take input from user i.e number of lines required (N value).
Take two loops one for each line (say ‘i’) and other for each digit in a particular line (say ‘j’). i starts from 1 and j starts from 1.
Take a result variable (say ‘a’) and initialize it with 1.
Here ‘i’ loop is used to access each line from 1 to n and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i value.
Print ‘a’ value along with * and post increment until the j loop reaches a value less than i.
Print the final value ‘a’ of each line and go to next line.
Repeat the ‘i’ loop until it reaches n.

Code in Java

import java.io.*;
class PrepInsta{
public static void main(String[] args) throws IOException {
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   int n, i, j, a = 1;
   System.out.print("Enter N value:");
   n = Integer.parseInt(br.readLine());
   for (i = 1; i <= n; i++) {
     for (j = 1; j < i; j++) {
       System.out.print((a++) + "*");
     }
     System.out.println(a++);
   }
  }
}