NPTEL WEEK 8 Q 4 : JAVA Programming Solution 2020

import java.util.*;

public class Pattern4 {

    public static void main(String[] args) {

        Scanner inr = new Scanner(System.in);

      int l = inr.nextInt();

        // Add the necessary code in the below space

​

      int ul=0; // Upper Line

    int ll=0; // Lower Line

    // Check whether line number is odd

    if (l%2!=0){

       ul=(l/2)+1;          

       ll=l-ul;

    //Code for upper half

    for(int i=1;i<=ul; i++){    

    //Space management

    for(int s=1;s<=(ul-i); s++){

        System.out.print(" ");

    }

    // Star management

    for(int j=1;j<=i; j++){

         System.out.print("* ");

    }

    System.out.println();

    }

    //Code for lower half

    int llc=ll;

    for(int i=1;i<=ll; i++){

    //Space management

    for(int s=llc;s<ll; s++){

       System.out.print(" ");

    }

    // Star management

    for(int j=1;j-1<=ll-i; j++){

       System.out.print(" *");

     }

     llc--;

    System.out.println();

        }

    }

        else{

       System.out.print("Invalid line number");

    }

​

    }

}