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The Lounge What is on Your Mind? Similar Threads Redesign for UNIX.com Post 303037271 by Neo on Sunday 28th of July 2019 02:25:17 AM
Also,
  • Updated the maximum number of similar threads to show to 10 (again) from 5.

I changed this from 5 to 10 a while back, but for some reason, it got switched back to 5.
 
Test Your Knowledge in Computers #121
Difficulty: Easy
The UNIX certification mark is commercially licensed by The Open Group.
True or False?

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Round(3)						User Contributed Perl Documentation						  Round(3)

NAME
Math::Round - Perl extension for rounding numbers SYNOPSIS
use Math::Round qw(...those desired... or :all); $rounded = round($scalar); @rounded = round(LIST...); $rounded = nearest($target, $scalar); @rounded = nearest($target, LIST...); # and other functions as described below DESCRIPTION
Math::Round supplies functions that will round numbers in different ways. The functions round and nearest are exported by default; others are available as described below. "use ... qw(:all)" exports all functions. FUNCTIONS
round LIST Rounds the number(s) to the nearest integer. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two integers are rounded "to infinity"; i.e., positive values are rounded up (e.g., 2.5 becomes 3) and negative values down (e.g., -2.5 becomes -3). round_even LIST Rounds the number(s) to the nearest integer. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two integers are rounded to the nearest even number; e.g., 2.5 becomes 2, 3.5 becomes 4, and -2.5 becomes -2. round_odd LIST Rounds the number(s) to the nearest integer. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two integers are rounded to the nearest odd number; e.g., 3.5 becomes 3, 4.5 becomes 5, and -3.5 becomes -3. round_rand LIST Rounds the number(s) to the nearest integer. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two integers are rounded up or down in a random fashion. For example, in a large number of trials, 2.5 will become 2 half the time and 3 half the time. nearest TARGET, LIST Rounds the number(s) to the nearest multiple of the target value. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two multiples of the target will be rounded to infinity. For example: nearest(10, 44) yields 40 nearest(10, 46) 50 nearest(10, 45) 50 nearest(25, 328) 325 nearest(.1, 4.567) 4.6 nearest(10, -45) -50 nearest_ceil TARGET, LIST Rounds the number(s) to the nearest multiple of the target value. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two multiples of the target will be rounded to the ceiling, i.e. the next algebraically higher multiple. For example: nearest_ceil(10, 44) yields 40 nearest_ceil(10, 45) 50 nearest_ceil(10, -45) -40 nearest_floor TARGET, LIST Rounds the number(s) to the nearest multiple of the target value. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two multiples of the target will be rounded to the floor, i.e. the next algebraically lower multiple. For example: nearest_floor(10, 44) yields 40 nearest_floor(10, 45) 40 nearest_floor(10, -45) -50 nearest_rand TARGET, LIST Rounds the number(s) to the nearest multiple of the target value. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are halfway between two multiples of the target will be rounded up or down in a random fashion. For example, in a large number of trials, "nearest(10, 45)" will yield 40 half the time and 50 half the time. nlowmult TARGET, LIST Returns the next lower multiple of the number(s) in LIST. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are between two multiples of the target will be adjusted to the nearest multiples of LIST that are algebraically lower. For example: nlowmult(10, 44) yields 40 nlowmult(10, 46) 40 nlowmult(25, 328) 325 nlowmult(.1, 4.567) 4.5 nlowmult(10, -41) -50 nhimult TARGET, LIST Returns the next higher multiple of the number(s) in LIST. TARGET must be positive. In scalar context, returns a single value; in list context, returns a list of values. Numbers that are between two multiples of the target will be adjusted to the nearest multiples of LIST that are algebraically higher. For example: nhimult(10, 44) yields 50 nhimult(10, 46) 50 nhimult(25, 328) 350 nhimult(.1, 4.512) 4.6 nhimult(10, -49) -40 VARIABLE
The variable $Math::Round::half is used by most routines in this module. Its value is very slightly larger than 0.5, for reasons explained below. If you find that your application does not deliver the expected results, you may reset this variable at will. STANDARD FLOATING-POINT DISCLAIMER Floating-point numbers are, of course, a rational subset of the real numbers, so calculations with them are not always exact. Numbers that are supposed to be halfway between two others may surprise you; for instance, 0.85 may not be exactly halfway between 0.8 and 0.9, and (0.75 - 0.7) may not be the same as (0.85 - 0.8). In order to give more predictable results, these routines use a value for one-half that is slightly larger than 0.5. Nevertheless, if the numbers to be rounded are stored as floating-point, they will be subject, as usual, to the mercies of your hardware, your C compiler, etc. AUTHOR
Math::Round was written by Geoffrey Rommel <GROMMEL@cpan.org> in October 2000. perl v5.18.2 2006-11-21 Round(3)

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