Java program to print number star half diamond pattern type 4

June 4, 2020

Print number star half diamond pattern type 4

Take input from user i.e number of lines required (N value) and starting ‘a’ 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.The program is divided into two sections for increment part (i.e first 4 lines) and decrement part (last 3 lines). Two separate i and j loops are written for each part. In first part i is from a to n and in the second part i is from (n-i) to a.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 ‘i’ value until the j loop reaches i value.Print the final value ‘i’ of each line and go to next line.Repeat the loop until the condition is failed.

Algorithm

Take input from user i.e number of lines required (N value) and starting ‘a’ 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.
The program is divided into two sections for increment part (i.e first 4 lines) and decrement part (last 3 lines). Two separate i and j loops are written for each part. In first part i is from a to n and in the second part i is from (n-i) to a.
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 ‘i’ value until the j loop reaches i value.
Print the final value ‘i’ of each line and go to next line.
Repeat the loop until the condition is failed.

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;
		System.out.print("Enter starting value:");
		a = Integer.parseInt(br.readLine());
		System.out.print("Enter N value:");
		n = Integer.parseInt(br.readLine());
		for (i = a; i <= n; i++) {
			for (j = a; j < i; j++) {
				System.out.print(i + "*");
			}
			System.out.println(i);
		}
		for (i = (n - 1); i >= a; i--) {
			for (j = 1; j < (i - 1); j++) {
				System.out.print(i + "*");
			}
			System.out.println(i);
		}
	}
}
This code is contributed by Shubham Nigam (Prepinsta Placement Cell Student)