CS 131 PROGRAMMING ASSIGNMENT 10 

Write a program that will determine the pay for a group of employees.
Input for each employee comes from a file and consists of:

     ID (integer between 1 and 1000)
     Number of hours worked (float between 0.0 and 50.0)
     Pay rate (float greater than 0.0, less than 100.0)
     Number of dependents (integer 0 through 10)
     Job category (integer 1,2 or 3)

Your program will ask the user to enter the file name.

Gross pay for the employee is hours times the pay rate for the first 40 hours 
plus overtime. Overtime for any hours above 40 is calculated at 1.5 times the 
pay rate.  For example, 

    Hours Rate  Gross Pay
     
     35    10   35*10 = 350
     46    10   40*10 + (46 - 40)*1.5*10 = 430

Net pay is calculated by deducting $100 per dependent from the gross pay. E.g.

    Gross Pay   Dependents  Net Pay
      350          0           350
      350          1           250
      350          2           150

Output (to a file):

        Employee Id and net pay for each employee.
        The total payroll (sum of the net pay).
        The ID of the employee with the highest net pay.

Use functions to read the data for an employee, to calculate the gross pay, 
and to calculate the net pay.  

* Check employee data for validity and do not process any data that
  is out of range. Use a function valid_data for this.