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Real constants and functions: Difference between revisions
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=={{header|Ada}}==
Most of the constants and functions used in this task are defined in the pre-defined Ada package Ada.Numerics.Elementary_Functions.
<lang ada>
Ada.Numerics.e -- Euler's number
Ada.Numerics.pi -- pi
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S'ceiling(x) -- Produces the ceiling of an instance of subtype S
x**y -- x raised to the y power
</
=={{header|ALGOL 68}}==
<pre>
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=={{header|BASIC}}==
{{works with|QuickBasic|4.5}}
<lang qbasic>abs(x) 'absolute value
sqr(x) 'square root
exp(x) 'exponential
log(x) 'natural logarithm
x ^ y 'power
'floor, ceiling, e, and pi not available</
=={{header|C}}==
Most of the following functions take a double.
<lang c>#include <math.h>
M_E; /* e - not standard but offered by most implementations */
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floor(x); /* floor */
ceil(x); /* ceiling */
pow(x,y); /* power */</
=={{header|Common Lisp}}==
<lang lisp>pi ;pi constant
(sqrt x) ;square root
(log x) ;natural logarithm
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(floor x) ;floor
(ceiling x) ;ceiling
(expt x y) ;power</
=={{header|D}}==
<lang d>import std.math ; // need to import this module
E // Euler's number
PI // pi constant
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floor(x) // floor
ceil(x) // ceiling
pow(x,y) // power</
=={{header|E}}==
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=={{header|Java}}==
All of these functions are in Java's <tt>Math</tt> class which, does not require any imports:
<lang java>Math.E; //e
Math.PI; //pi
Math.sqrt(x); //square root--cube root also available (cbrt)
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Math.floor(x); //floor
Math.ceil(x); //ceiling
Math.pow(x,y); //power</
=={{header|JavaScript}}==
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=={{header|OCaml}}==
Unless otherwise noted, the following functions are for floats only:
<lang ocaml>sqrt x;; (* square root *)
log x;; (* natural logarithm--log base 10 also available (log10) *)
exp x;; (* exponential *)
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floor x;; (* floor *)
ceil x;; (* ceiling *)
x ** y; (* power *)</
=={{header|Perl}}==
<lang perl>use POSIX;
exp(1); # e
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POSIX::floor($x); # floor
POSIX::ceil($x); # ceiling
$x**$y; # power</
=={{header|PHP}}==
<lang php>M_E; //e
M_PI; //pi
sqrt(x); //square root
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floor(x); //floor
ceil(x); //ceiling
pow(x,y); //power</
=={{header|Pop11}}==
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=={{header|Python}}==
<lang python>import math
math.e # e
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math.ceil(x) # ceiling
x ** y # exponentiation (and used with an exponent of 0.5 for square roots)
</
=={{header|Ruby}}==
<lang ruby>Math::E #e
Math::PI #pi
Math.sqrt(x) #square root
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x.floor #floor
x.ceil #ceiling
x ** y #power</
=={{header|Scheme}}==
<lang scheme>(sqrt x) ;square root
(log x) ;natural logarithm
(exp x) ;exponential
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(floor x) ;floor
(ceiling x) ;ceiling
(expt x y) ;power</
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