Due: 9/29, HW 2

This assignment is meant to give you some practice with the server and
to use many of the programming pieces you have learned in class. You
will use a while loop and an if statement as well as cin and
cout. Here is the problem statement: 

This assignment is essentially to read in two values, multiply them
and then output their results. Your boss has asked you to write a
program to read in a velocity (in m/s) and a time (in m). velocity
values can be any real number while time is limited to positive
integers. If the program user enters a negative value for time, please
ask them to enter a proper value (repeatedly if necessary) until a
proper positive value for time is given. Finally, given these values,
please compute the value of velocity times time and make an output
based on whether the result is positive or negative following the
examples below:

If the result is positive then output:
You have moved x meters.

If the result is negative, then make it positive and then output:
You have been moved back x meters.

Examples program runs:

./hw2
Please input real-valued velocity (m/s):  3.5
Please input positive integer time (s): -1
Incorrect input, try again: -3
Incorrect input, try again: 3
You have moved 10.5 meters.


./hw2
Please input real-valued velocity (m/s):  -3.5
Please input positive integer time (s): 3
You have been moved back 10.5 meters.