left.java

import java.util.Scanner;
class  left
{
	static Scanner sc=new Scanner(System.in);
	public static void main(String[] args) 
	{
		System.out.print("Enter the n num:");
		int n=sc.nextInt();
		//1st half diamond
		for (int i=0;i<n ;i++ )//outer for loop
		{
			for (int j=0;j<n;j++ )//inner loop-1(left angle triangle)
			{
				if((i+j)>=n-1)
				{
					System.out.print("* ");
				}
				else
				{
					System.out.print("  ");
				}
			}
			for (int k=0;k<n ;k++ )//inner loop-2(right angle triangle)
			{
				if(i>k)
					System.out.print("* ");
				else
					System.out.print("  ");
			}
			System.out.println();
		}
		//second half diamond
		for (int i=1;i<=n;i++ )
		{
			for (int j=1;j<=n ;j++)
			{
				if(i<j)
					System.out.print("* ");
				else
					System.out.print("  ");
			}
			for (int j=1;j<=n;j++)
			{
				if(i+j<= n-1)
					System.out.print("* ");
				else
					System.out.print("  ");
			}
			System.out.println();
		}
	}
}