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

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  1. #1
    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. #2
    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. #3
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,264
    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.

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