How do i go about doing calculation function?

[Tampopo]

Say, i have a display() that display the name and particulars of a employee.
I have a base class Employee() and 2 derive class TempEmployee and ContractEmployee classes. How do i go about defining a
Calculation function that have this formula:

Yearly gross pay = (12 x monthlyPay) + (OvertimeRate * noOfOvertimeHours)

Lets say for my base class i have relevant fields like:

float monthlyPay;
float Overtimerate;
float noOfOvertimeHours;

My method will be:
float calculatePay();

What do i need to pass in for this?
As in the way to implement the fields in..

[Gaminic]

Looks like you don't really know how functions work. Take a look at this page:
http://www.cplusplus.com/doc/tutorial/functions/

Ultimately, a function consist of three 'decisions':
-What input does it need? ("Parameters")
-What calculations does it need to do? ("Function body")
-What output does it provide? ("Return value")

Once you have that, you're good to go!

[Tampopo]

Sorry dbl post.. was using mobile to post this. the network was slow back then. I'll try and give the outcome

[Gaminic]

A doublepost with over half an hour in between and different description of the same problem. Your network must be pretty terrible.

[Tampopo]

It showed error, and i accidentally override the whole text when i select all and tried to copy. end up can't undo.

Anyway, if lets say I have my declaration of:

float monthlyPay;
float overtimeHr;
float overtimeRate;

And in the constructor I have:

Staff::Staff(float mPay, float otHour, float otRate)
{
   monthlyPay = mPay;
   overtimeHr = otHour;
   overtimeRate = otRate;
}

Do I pass in the mPay or monthlyPay?

Formula = (12 months * monthly pay) + (number of overtime hours * overtime payrate)

Is this correct?

float calculatePay(float mPay, float otHour, float otRate)
{
   float grossSalary;
   grossSalary = (12 * mPay) + (otHour * otRate);
   return grossSalary;
}

[Gaminic]

Yep, that's perfect.

If you want a little more elegance (but less readability), you can simply skip the temporary object:

float calculatePay(float mPay, float otHour, float otRate)
{
     return (12 * mPay) + (otHour * otRate);
}

Either way is fine though!

[Tampopo]

Ahh great. Thks for the tip

Another issue is that I have a display()

Staff::display()
{
cout<< "Staff's name        : "<< name <<endl;
cout<< "Staff's monthly pay : $"<< monthlyPay <<endl;
}

How do I put this function inside such that my static objects are able to print out the proper gross pay?

[Gaminic]

Do you want Staf::display() to also print the gross pay?

You can output (or use in any other way) the return value of a function just like you would a variable of that type. cout << calculatePay(mPay, otHour, otRate) << endl; will output the value of calculatePay.

[Tampopo]

Ahh. Awesome it worked but instead of mPay i use monthlyPay

Staff::Staff(float mPay, float otHour, float otRate)
{
   name = n;
   monthlyPay = mPay;
   overtimeHr = otHour;
   overtimeRate = otRate;
}

I tried that because in the display(), i use name instead of the "n" like above.

Staff::display()
{
cout<< "Staff's name        : "<< name <<endl;
cout<< "Staff's monthly pay : $"<< monthlyPay <<endl;
}

Weird. Should be using the n ...mPay..otHour instead.. don't know why it worked..

[Gaminic]

No, it's correct. 'monthlyPay' is a member of Staff objects, where 'mPay' is just a temporary variable during the function call.

The 'name = n' doesn't make much sense though, as you don't pass a variable 'n' to your Constructor. Where is it coming from?

[Tampopo]

Okay I got you bud. thanks for help!

[Tampopo]

One last question - How do I calculate all the monthly pay of all the staff?
As in the total amount to be paid to every single staff.

[Tampopo]

is it possible to do a addition of every staff gross salary in the array?