Printing Pascal Triangle.

import java.util.Scanner;
class Pascal
{
static int factorial(int n)
{
  int sum = n;
  for(int k=n-1;k>=1;k--)
    sum*=k;
  if(sum!=0)
    return sum;
  else
    return 1;
}
public static void main(String...args)
{
  int s,lines;
  Scanner sc = new Scanner(System.in);
  System.out.println("Enter no of lines:");
  lines = sc.nextInt();
  for(int i=0;i<lines;i++)
  {
    for(int j=lines;j>i;j--)
      System.out.print(" ");
    for(int k=0;k<=i;k++)
    {
      s = factorial(i)/(factorial(k)*factorial(i-k));
      System.out.print(s+" ");
    }
    System.out.println();
  }
}
}