Java program to print number star right triangle pattern type 3

June 4, 2020

Print number star right triangle pattern type 3

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 N and j starts from 1.Take a result variable (say ‘a’) and initialize it with 1, t with 4, k with 3.Divide the pattern into two i.e, parts even and odd lines.Here ‘i’ loop is used to access each line from n to 1 and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i-1 value in odd lines and k value in even lines.Print ‘a’,’t’ value along with * and post increment.Print the final value ‘a’ and ‘t’ 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 N and j starts from 1.
Take a result variable (say ‘a’) and initialize it with 1, t with 4, k with 3.
Divide the pattern into two i.e, parts even and odd lines.
Here ‘i’ loop is used to access each line from n to 1 and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i-1 value in odd lines and k value in even lines.
Print ‘a’,’t’ value along with * and post increment.
Print the final value ‘a’ and ‘t’ 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, t = 4, k = 3;
     System.out.print("Enter N value:");
     n = Integer.parseInt(br.readLine());
    for (i = 1; i <= n; i++) {
      if (i % 2 != 0) {
        for (j = 1; j < (i - 1); j++) {
         System.out.print((a++) + "*");
        }
        System.out.println(a++); 
     } 
     else{
      for (j = 1; j < k; j++) {
        System.out.print((t++) + "*");
      }
      System.out.println(t++);
      k++;
      }
    }
  }
}
This code is contributed by Shubham Nigam (Prepinsta Placement Cell Student)