Solved

constants

Posted on 2000-04-09
316 Views
can someone help me understand constants please. Here is my program i'm writing, but it's not working the deductions right.
char lastName[10];
char firstName[10];
float hoursWorked;
double grossPay =0;
double rate;
const double sTax    = .075;
const double fTax    = .15;
const double miscDed = .20;
double netIncome;
double deduction;

//Calculate pay and deductions
grossPay = hoursWorked * rate;
deduction = (sTax + fTax + miscDed);
netIncome = grossPay * deduction;

thanks,
nationnon

0
Question by:nationnon
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points
• 4
• 2
• 2
• +1

LVL 2

Expert Comment

ID: 2698942
what kind of output are you getting
0

LVL 1

Author Comment

ID: 2698987
Enter hours worked: 40
Enter pay rate: 10
r r's gross pay was 400 but after deductions pay is now 170

Press any key to continue

0

LVL 1

Author Comment

ID: 2698991
that's not the right deduction
are the constants right?
0

LVL 2

Expert Comment

ID: 2699075
nationnon:
your constants are fine.  your code is also fine except the last line. I believe it should read:
netIncome=netIncome - netIncome * deduction.
Give this a try.
0

LVL 2

Expert Comment

ID: 2699078
correction: netIncome = grossPay - grossPay * deduction;
0

Expert Comment

ID: 2699470
Hi,
I think u need to use the following formula,

deduction = (sTax + fTax + miscDed)*rate * hoursWorked ;
netIncome = grossPay - deduction;

Thats it....

0

LVL 22

Expert Comment

ID: 2700241
True, but the other problem is that sTax and fTax are holding the tax _percents_ not the tax themselves.

Use an exampel to help you.  If you are in the 10% bracket (I wish) and you earn \$100 (okay I don't wish) your tax should be \$10 and you net shoudl be \$90.

So

Tax = TaxPercent*Gross;
Net = Gross-Tax;
0

LVL 22

Accepted Solution

nietod earned 40 total points
ID: 2700275
double grossPay =0;
double rate;
const double sTaxPct    = .075;
const double fTaxPct    = .15;
const double miscDedPct = .20;
double sTaxAmt ;
double fTaxAmt;
double miscDedAmt;

double netIncome;
double deduction;

//Calculate pay and deductions
grossPay = hoursWorked * rate;
sTaxAmt = sTaxPct*grossPay;
fTaxAmt = fTaxPct*grossPay;
miscDedAmt = miscDedPct*grossPay;

deduction = (sTaxAmt + fTaxAmt + miscDedAmt);
netIncome = grossPay - deduction;

netIncome = grossPay * deduction;

was close, but it was calculatign the total deduction amount, not the net amount.  It should have been

netIncome = grossPay * (1-deduction);

but the method I give above is better when you have to start considering rounding to cents.)
0

LVL 2

Expert Comment

ID: 2701126
kishore joshi:
you just stated my answer in a different form.
0

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there isâ€¦
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more â€¦
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.
Suggested Courses
Course of the Month1 day, 14 hours left to enroll