08-24-2011
Quote:
Originally Posted by
Iceman69
I have no clue on why this teacher wants us to use whole numbers in place of .03 for the tax.
Probably because most shells can't do math on numbers with decimal points. They'd either give a completely unexpected result, or discard the decimal points entirely.
Another reason whole numbers are used for finances is accuracy. Most languages which support decimal points use floating point numbers to do so, which actually have a fixed number of decimal places and multiply by 2^n to represent very large or very small numbers. This is a good approximation for math, but if you're dealing with finances, you might create headaches for accountants by being out quite a few cents here and there every time you add huge numbers of dollars.
How to use whole numbers instead of decimal points? Calculate everything in cents. No decimals needed (except maybe for printing).
How I'd convert decimal point to whole numbers is to multiply by 100... since you can't do that math on decimal-point numbers in the shell, use a number trick instead; split "13.42" into "13" and "42", make sure "42" is exactly two digits long, then stick them together into "1342". Voila, whole number in cents.
How to do this depends on your shell. What is it?
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LEARN ABOUT HPUX
_decodedecimal32
_decodedecimal64(3M) _decodedecimal64(3M)
NAME
_decodedecimal64(), _decodedecimal128(), _decodedecimal32() - decode decimal-encoded decimal data
SYNOPSIS
DESCRIPTION
There are two standard bit-encodings for decimal floating-point data: binary and decimal. Both encoding provide exactly the same data
(analogous to big endian and little endian encodings). The HP-UX decimal floating-point types use the binary encoding.
The function decodes x, interpreted as a decimal-encoded 64-bit decimal datum, into the encoding for
is a version of it takes a argument and returns a result.
is a version of it takes a argument and returns a result.
These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.
USAGE
To use any of these functions, compile with the option.
Make sure your program defines and then includes
Link in the math library by specifying or on the linking command line.
For more information, see the at the following site:
RETURN VALUE
returns x in the encoding for
raises no exceptions.
ERRORS
No errors are defined.
SEE ALSO
_decodebinary64(3M), _encodebinary64(3M), _encodedecimal64(3M), math(5).
STANDARDS CONFORMANCE
These functions are not specified in any standard.
HP Integrity Server Only _decodedecimal64(3M)