pascal's triangle java 2d array
import java.util.Scanner;
class Pascal_Triangle
{//opening of class
public static void main(String args[])
{//opening of main
Scanner sc=new Scanner(System.in);
int n,i,j,a[][],s;
//taking user's input.
System.out.println("HOW MANY STEPS?");
n=sc.nextInt();
s=n-1;
a=new int[n][n];
//filling the 2D matrix.
for(i=0;i<n;i++){
for(j=0;j<=i;j++)
if(j==0 || j==i)
a[i][j]=1;
else
a[i][j]=a[i-1][j-1]+a[i-1][j];
}
//displaying the Pascal's Triangle as the output.
System.out.println("\nOUTPUT:\n");
for(i=0;i<n;i++)
{
for(j=0;j<=s;j++)
System.out.print(" ");//printing blank spaces at the beginning of rows
s--;
for(j=0;j<=i;j++)
System.out.print(a[i][j]+" ");
System.out.println();
}
}//clossing of main
}//closing of class