Diamond.java

import java.util.Scanner;

public class Diamond {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter number of rows: ");
        int n = sc.nextInt();

        // Upper half
        for (int i = 1; i <= n; i += 2) {
            for (int j = 0; j < (n - i) / 2; j++) System.out.print(" "); // Print spaces
            for (int j = 0; j < i; j++) System.out.print("*"); // Print stars
            System.out.println();
        }

        // Lower half
        for (int i = n - 2; i > 0; i -= 2) {
            for (int j = 0; j < (n - i) / 2; j++) System.out.print(" ");
            for (int j = 0; j < i; j++) System.out.print("*");
            System.out.println();
        }

        sc.close();
    }
}