PascalsTriangle Java Program

// Name: Sammy Samkough
// Prog: Pascals Triangle
// Spec: To create a pascals triangle using a 2-Dimensional array

import java.util.Scanner;

public class PascalsTriangle
{
	private int[][] mat;

	/** Makes a 0x0 matrix*/
	public PascalsTriangle()
	{
		mat = new int[0][0];
	}

	/** Makes a square matrix dimensioned size x size */
	public PascalsTriangle(int size)
	{
		mat = new int[size][size];
	}

	/** Constructs a Pascal's Triangle for this matrix */
	public void createTriangle()
	{
		for (int r = 0; r < mat.length; r++)
		{
			mat[r] = new int[r + 1];
			mat[r][0] = 1;
			mat[r][r] = 1;

			for (int c = 1; c < r; c++)
			{
				mat[r][c] = mat[r - 1][c] + mat[r - 1][c - 1];
			}
		}

		for (int r = 0; r < mat.length; r++)
		{
			for (int c = 0; c < mat[r].length; c++)
			{
				System.out.print(" " + mat[r][c]);
			}
			System.out.println("\n");
		}
		System.out.println("");
	}

	/** @return a matrix with tabs between items and newlines for each row */
	public String toString()
	{
		String output = "";

		// output += "\nPascal's Triangle: " + mat.createTriangle();

		return output;
	}
}
------------------------------------------------------------------------------------------------------------------------------
// Name: Sammy Samkough
// Prog: Pascals Triangle
// Spec: To create a pascals triangle using a 2-Dimensional array

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

public class PascalsTriangleRunner
{
	public static void main(String[] args)
	{
		PascalsTriangle pt = new PascalsTriangle(2);

		System.out.println("Size 2:");
		pt.createTriangle();
		System.out.println(pt);

		pt = new PascalsTriangle(3);
		System.out.println("Size 3:");
		pt.createTriangle();
		System.out.println(pt);

		pt = new PascalsTriangle(4);
		System.out.println("Size 4:");
		pt.createTriangle();
		System.out.println(pt);

		pt = new PascalsTriangle(5);
		System.out.println("Size 5:");
		pt.createTriangle();
		System.out.println(pt);
	}
}
/*
Size 2:
 1 1 1

Size 3:
 1 1 1 1 2 1

Size 4:
 1 1 1 1 2 1 1 3 3 1

Size 5:
 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1

Press any key to continue . . .
*/