/**************************************************************************************************
 *  Program Name:     Programming Project 4.6: Multiplication Table
 *  Author:           Terry Weiss
 *  Date Written:     September 25, 2015
 *  Course/Section:   CSC 111-003W
 *  Program Description:
 *     Design and implement an application that produces a multiplication table, showing the
 *  results of multiplying the integers 1 through a user-defined maximum by themselves.
 **************************************************************************************************/
 
import java.util.Scanner;


public class MultTable
{

    public static void main( String[] args )
    {
        final int MIN_FACTOR = 1, MAX_FACTOR = 20;
        String number;
        int highestFactor, row, column;
        Scanner user_input = new Scanner(System.in);
        
        do
        {
            System.out.print("Please enter how high you'd like to multiply (up to 20):  ");
            number = user_input.next();

            try {
                highestFactor = Integer.parseInt(number);
            } catch (NumberFormatException e) {
                System.out.print("That's not a number! ");
                highestFactor = -1;
            }
        } while (highestFactor < MIN_FACTOR || highestFactor > MAX_FACTOR);


        // Print the header row
        System.out.print(" x\t");
        for (column = 1; column <= highestFactor; column++)
        {
            System.out.format("%3d\t", column);
        }
        System.out.print("\n");
        
        // Print table
        for (row = 1; row <= highestFactor; row++ )
        {
            System.out.format("%2d|\t", row);   // Display row number
            
            for (column = 1; column <= highestFactor; column++)
            {
                System.out.format("%3d\t", (row * column));
            }
            
            System.out.print("\n");
        }
    }
    
}

/*
Please enter how high you'd like to multiply (up to 20):  12
 x	  1	  2	  3	  4	  5	  6	  7	  8	  9	 10	 11	 12	
 1|	  1	  2	  3	  4	  5	  6	  7	  8	  9	 10	 11	 12	
 2|	  2	  4	  6	  8	 10	 12	 14	 16	 18	 20	 22	 24	
 3|	  3	  6	  9	 12	 15	 18	 21	 24	 27	 30	 33	 36	
 4|	  4	  8	 12	 16	 20	 24	 28	 32	 36	 40	 44	 48	
 5|	  5	 10	 15	 20	 25	 30	 35	 40	 45	 50	 55	 60	
 6|	  6	 12	 18	 24	 30	 36	 42	 48	 54	 60	 66	 72	
 7|	  7	 14	 21	 28	 35	 42	 49	 56	 63	 70	 77	 84	
 8|	  8	 16	 24	 32	 40	 48	 56	 64	 72	 80	 88	 96	
 9|	  9	 18	 27	 36	 45	 54	 63	 72	 81	 90	 99	108	
10|	 10	 20	 30	 40	 50	 60	 70	 80	 90	100	110	120	
11|	 11	 22	 33	 44	 55	 66	 77	 88	 99	110	121	132	
12|	 12	 24	 36	 48	 60	 72	 84	 96	108	120	132	144	
*/