man CORBA::ORBit::Fixed () - Fixed point arithmetic for CORBA.
NAME
CORBA::ORBit::Fixed - Fixed point arithmetic for CORBA.
SYNOPSIS
use CORBA:::ORBit::Fixed;
$a = new CORBA::Fixed "+123454", 3 print $a + 1.0 # produces "+124.454"
DESCRIPTION
CORBA::ORBit::Fixed implements arithmetic operations on fixed point numbers. It is meant to be used in conjuction with the CORBA::ORBit module, but could conceivable be useful otherwise. Note that the file is called CWCORBA::ORBit::Fixed, but it implements the generic package CWCORBA::Fixed.
Internal representation
Internally, numbers are as represented as a pair of a CWMath::BigInt multiple precision integer, and a integer scale. (positive or negative).
Arithmetic operations
Addition, subtraction, and multiplication are carried out precisely. For adddition and subtraction, of two numbers with scales CWs1 and CWs2, the resulting scale is CWMAX(s1,s2). For multiplication the resulting scale is CWs1+s2.
Division is carried out to 31 decimals places, with additional digits truncated without rounding. Aside from overloaded CW+, CW-, CW*, CW/ CW<=> and CW"" operations, CWCORBA::ORBit::Fixed provides the following methods:
- new STRING SCALE
- Given a string (as suitable for input to CWMath::BigInt), and a scale, create a fixed-point value with the digits and sign of STRING, and the scale SCALE.
- from_string STRING
- Create a CORBA::Fixed object from a string according to the rules in the CORBA manual for fixed literals. That is, the scale is given by the number of digits to the right of the decimal point, ignoring trailing zeros. If the number has no non-zero digits to the right of the decimal point, the scale will be the negative of the number of trailing zeros to the left of the decimal point.
- to_digits ( NDIGITS, SCALE )
- Gives the digits (with a leading CW+ or CW- sign) of the the object's value, rounded to the SCALE, and padded to NDIGITS.
- *
AUTHOR
Owen Taylor <otaylor@gtk.org>