The exercise below will ask user enter a number and display the information about "even" or "odd".  The two examples of user and programmer interface are shown below.  Blue color - programmer.  Red color - user.
Please enter a number.
4
You entered 4.
4 is an even number.		 Please enter a number.
99
You entered 99.
99 is an odd number.

I.  Understand the problem.
    INPUT:       num.
    OUTPUT:   even or odd?
2.  Find the solution - how can a computer get the output after you input a number?
     HINT:  If the number can be divided by 2 evenly, it is even, otherwise, odd.
 
3.  Translate the above flowchart into C++ language.

You have to break one sentence of output into several items and use "<<" to separate  them.  For example,
       You entered 4.
Two items are involved in.  One is "You entered" and the other is a number from NUM.  Similar to the following statement:
      4 is an even number.
Two items are involved in.  One is a number in NUM and the other is " is an even number."

4.  Debug your program. - Type in your program, compile, link and run.
5.  Write a notes for yourself. -  Add a block comment and line comments.