Homework 2 Solution

Design a new type called payrollT that is capable of holding the data for a list of employees, each of which is represented using the employeeT type introduced in the section on “Dynamic records” at the end of the chapter. The type payrollT should be a pointer type whose underlying value is a record containing the number of employees and a dynamic array of the actual employeeT values, as illustrated by the following data diagram:


nEmployees

 

employees

 

 

array of

employeeT


After writing the types that define this data structure, write a function GetPayroll that reads in a list of employees, as shown in the following sample run:

 

After the input values have been entered, the GetPayroll function should return a value of type payrollT that matches the structure shown in the diagram.

 

13.  Write a program that generates the weekly payroll for a company whose employment records are stored using the type payrollT, as defined in the preceding exercise. Each employee is paid the salary given in the employee record, after deducting taxes. Your program should compute taxes as follows:

 

•  Deduct $1 from the salary for each withholding exemption. This figure is the adjusted income. (If the result of the calculation is less than 0, use 0 as the adjusted income.)

 

•  Multiply the adjusted income by the tax rate, which you should assume is a flat 25 percent.

 

For example, Bob Cratchit has a weekly income of $15. Because he has seven dependents, his adjusted income is $15 – (7 x $1), or $8. Twenty-five percent of $8 is $2, so Mr. Cratchit’s net pay is $15 – $2, or $13.

 

The payroll listing should consist of a series of lines, one per employee, each of which contains the employee’s name, gross pay, tax, and net pay. The output should be formatted in columns, as shown in the following sample run:

 
Hint: First download the program provided by the textbook and Makefile that I put under hw-02 directory or attached here. Compile and execute it. Once you understand what it does, then implement the necessary functions, data structures etc. to do the things in the above questions. In this program, you will find some already implemented code which can help to complete this hw. (Also, I changed all the textbook specific memory allocation things with malloc in that program. So you can simply use gcc to compile it, but you need to check if memory is allocated or not after each malloc. Please make these corrections, too!).
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