# Thread: Using an array to do calculations with a FOR statement

1. Registered User
Join Date
Mar 2013
Posts
3

## Using an array to do calculations with a FOR statement

The following code won't work if you run it (if you remove the var fedTable it will).

Basically, I need to tap into the declared array var fedTable to do withholding calculations.

I need to first declare where the person stands in the table, and then perform the calculation based off of where they stand.

Code:
```<HTML>
<script language="JavaScript">

// Payroll Processing Program by Sprrr - - - - payroll2.html

// Fed Tax Array
var fedTable = new Array(     51,         0,  .15
525,    71.10,  .28
1125,  239.10,  .31
2535,  676.20,  .36
5475, 1734.60, .396);

// Variables
document.writeln('Welcome to the online payroll processing program');
document.writeln();
go_on = 'Y'
empname = prompt('Enter any employee name','');

function do_calc()
{
if (hours > 40) gross_pay = 40 * payrate + (hours - 40) * payrate * 1.5;
if (hours <= 40) gross_pay = hours*payrate;
total_pay = gross_pay*0.0175
}

function do_display()
{
document.writeln('The Payroll for: ',empname,'<P>');
document.writeln('Payrate: ',payrate,'<BR>');
document.writeln('Hours Worked: ',hours,'<BR>');
document.writeln('Gross Pay: ',gross_pay,'<BR>');
document.writeln('Total Pay After Withholdings: ',gross_pay - total_pay);
go_on = prompt('Do you want to process another employee? Y or N','Y');
if (go_on == 'Y') empname = prompt('Enter any Employee Name','');
}

while ((empname != '') & (go_on == 'Y'))
{
payrate = prompt('Enter the Employees Payrate','');
hours   = prompt('Enter the hours worked','');

// Payroll calculations
do_calc()

// Output
do_display()
}

</script>
</HTML>```
The first number in each row (first number on the left) is a money amount. For instance, if the user falls between \$51 and \$524, they will get their earnings withheld according to the \$51 row (flat \$0 reduction and .15%).

If they fall between \$525 and \$1124, they are within the \$525 row and get a flat \$71.10 reduced and 28% too.

And so on.

Can anyone give me any pointers?

The end product needs to get their total pay and subtract from it the flat/percentage amount in the table correspondingly.

2. Registered User
Join Date
Mar 2013
Posts
3
Here's an update, I'm trying to declare where they stand in the table by using a var row_save, but it's still not working.

Code:
```<HTML>
<script language="JavaScript">

// Payroll Processing Program by Sprrr - - - - payroll2.html

// Federal Tax Array
var fedTable = new Array( 51, 0, .15
525, 71.10, .28
1125, 239.10, .31
2535, 676.20, .36
5475, 1734.60, .396);

var row_save = 0;
For (r=0; r<5; r++);
if(gross_pay >= fedTable [r][0]) row_save = r;

// Variables
document.writeln('Welcome to the online payroll processing program');
document.writeln();
go_on = 'Y'
empname = prompt('Enter any employee name','');

function do_calc()
{
if (hours > 40) gross_pay = 40 * payrate + (hours - 40) * payrate * 1.5;
if (hours <= 40) gross_pay = hours*payrate;
total_pay = gross_pay*0.0175
fed_with = fedTable [row_save][1] + (total_pay - fedTable [rowsave][0]) * fedTable [row_save][1][2];

}

function do_display()
{
document.writeln('The Payroll for: ',empname,'<P>');
document.writeln('Payrate: ',payrate,'<BR>');
document.writeln('Hours Worked: ',hours,'<BR>');
document.writeln('Gross Pay: ',gross_pay,'<BR>');
document.writeln('Total Pay After Withholdings: ',gross_pay - total_pay);
document.writeln('Federal Withholdings: ',fed_with);
go_on = prompt('Do you want to process another employee? Y or N','Y');
if (go_on == 'Y') empname = prompt('Enter any Employee Name','');
}

while ((empname != '') & (go_on == 'Y'))
{
payrate = prompt('Enter the Employees Payrate','');
hours   = prompt('Enter the hours worked','');

// Payroll calculations
do_calc()

// Output
do_display()
}

</script>
</HTML>```

3. Registered User
Join Date
Oct 2010
Location
Versailles, France
Posts
1,290
Do not use document.write or writeln in functions ! They are made for open documents and work only at the opening of the page !
Last edited by 007Julien; 03-26-2013 at 08:01 AM.