PATTERN 21

import java.util.*;

class Pattern_21{

public static void main(String args[]){

Scanner sc= new Scanner(System.in);

System.out.println("Enter no of rows");

int n= sc.nextInt();

int r,c,blnk=0;

char ch='*';

for(r=1;r<=n;r++)

{

                for(blnk=n-1; blnk>=r;blnk--)

                {

                System.out.print(" ");

                }

                for(c=1;c<=2*r-1;c++)

                {

                if(r==n || c==1 || c== (2*r-1))   System.out.print(ch);

                else                                                        System.out.print(" ");   

                }

System.out.println();

}

}}