Ask the user to provide an int: 
Enter an int: 123
Output: sum of the odd digits that make up the input value

ReverseNumber.java 
Input: 123
Output: 321

Whishful thinking: I wish I could access the individual digits of the input

123 % 10 ---> 3
123/10 = 12 % 10 ---> 2
12 / 10 = 1 % 10 ---> 1
1 / 10 = 0

Application#1: OddDigitsSum.java

- 2D arrays:

int[][] mat = new int[3][3];

mat.length ---> # of rows
mat[0].length ---> # of columns

mat				RowAvgs
0	1	2		1.0
10	11	12		11.0
20	21	22		21.0

10.0	11.0	12.0		ColAvgs

mat[row][col] = row * 10 + col

Application#2: TwoDArrayDemo.java

Objective: show you how to create a two dimensional array using initializer list

int[] arr = {1, 2, 3};

Application#3: RowColAvgs.java

mat				RowAvgs
0	1	2		1.0 ---> RowAvgs[0]
10	11	12		11.0 ---> RowAvgs[1]
20	21	22		21.0 ---> RowAvgs[ROWS - 1]

10.0	11.0	12.0		ColAvgs
ColAvgs[0] ...etc

RowAvgs[0] = mat[0][0] + mat[0][1] + mat[0][2] / COLS; 



















