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sales tax

Posted on 2003-03-29
Medium Priority
Last Modified: 2010-04-15
I am not a programmer. I am looking to find the source code to calculate the
sales tax of number of items enter. Any help would be wonderful. The source code should be in C in Windows.

Input: # of items, price of each item, sales tax% of your state(will us 5%), amount tendered

Output: total and change returned if any

Question by:ladiet
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Accepted Solution

adg080898 earned 100 total points
ID: 8230408
I doubt anyone will sit down and write the whole program for you.

In any case, it is very simple to calculate (here is some pseudocode):


subtot = 0
for each item {
    subtot += qty * unitprice

tax = subtot * taxrate
total = subtot + tax

change = amtpaid - total


Where taxrate is 0.05 for 5% tax

Assisted Solution

bvbb earned 100 total points
ID: 8230765
Here's a function that will do this. It assumes money amounts are stored as cents so they can be integers. If you're truly not a programmer, this won't be all you need, as it must be tied into the rest of your application.

int totalwithtax(int itemcount, int prices[], float rate, int tender, int totaltax, int change);
int totalwithtax(//calculate order total with sales tax
     int itemcount,     //number of items
     int prices[],          //array of item prices (in cents)
     float rate,               //tax rate as a fraction (for example, .0525 for 5.25%)
     int tender,               //amount tendered (in cents)
     int totaltax,          //used to return total sales tax to calling program (in cents)
     int change,               //used to return change owed to calling program (in cents)
     //function return value: total amount of order (in cents)
     int total=0;
     for ( i = 0; i < itemcount ; i++ ){
     return total;

Expert Comment

ID: 8233700
If you have Excel or other spreadsheet software then I would recommend that you use it to calculate your totals. It would be a lot less work than making a program from srcatch to do it.

In Excel you could record a few macros and assign them to buttons to clear the page and a field to enter amounts. Simple formulas would calculate the total, tax, and change.
LVL 20

Expert Comment

ID: 10187251
Nothing has happened on this question in more than 9 months. It's time for cleanup!

My recommendation, which I will post in the Cleanup topic area, is to
split points between adg and bvbb.


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