Java Program to display the Pascal's triangle

import java.util.Scanner;
public class demo1 
{
  public static void main(String[] args)
  {
    int row,c=1,a,i,j;
    System.out.print("Input number of rows: ");
    Scanner input = new Scanner(System.in);
    row = input.nextInt();

    for(i=0;i<row;i++)
    {
        for(a=1;a<=row-i;a++)
        System.out.print(" ");
        for(j=0;j<=i;j++)
        {
            if (j==0||i==0)
                c=1;
            else
               c=c*(i-j+1)/j;
            System.out.print(" "+c);
        }
        System.out.print("\n");
    }
   }
}