Real constants and functions: Difference between revisions

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~~{{task|Basic language learning}}[[Category:Arithmetic operations]]~~Show how to use the following math constants and functions in your language (if not available, note it):

[[Category:Arithmetic operations]]

[[Category:Simple]]

⚫

Show how to use the following math constants and functions in your language (if not available, note it):

*<math>e</math> (base of the natural logarithm)

*<math>\pi</math>

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x ** y # power #

))</lang>

Output:

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# outputs 1.41421, 0.693147, 7.38906, 0.0947323</lang>

<blockquote style="font-size: smaller;">'''Power's note:'''

<blockquote style="font-size: smaller;">'''Power's note:''' With [[nawk]] or [[gawk]], <code>2 ** -3.4</code> acts like <code>2 ^ -3.4</code>. With [[mawk]], <code>2 ** -3.4</code> is a syntax error. Nawk allows <code>**</code>, but its manual page only has <code>^</code>. Gawk's manual warns, ''"The POSIX standard only specifies the use of `^' for exponentiation. For maximum portability, do not use the `**' operator."''</blockquote>

With [[nawk]] or [[gawk]], <code>2 ** -3.4</code> acts like <code>2 ^ -3.4</code>.

With [[mawk]], <code>2 ** -3.4</code> is a syntax error.

Nawk allows <code>**</code>, but its manual page only has <code>^</code>.

Gawk's manual warns, ''"The POSIX standard only specifies the use of `^' for exponentiation.

For maximum portability, do not use the `**' operator."''</blockquote>

Awk misses e, pi, absolute value, floor and ceiling; but these are all easy to implement.

Awk misses e, pi, absolute value, floor and ceiling; but these are all easy to implement:

<lang awk>BEGIN {

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=={{header|Axe}}==

In general, Axe does not support many operations on real numbers. ~~However, there are a few special cases that it does support.~~

In general, Axe does not support many operations on real numbers.

However, there are a few special cases that it does support.

To take the square root of an integer X:

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In addition to the java.lang.Math.abs() method, each numeric type has an abs() method, which can be invoked directly on the number:

<lang groovy>println ((-22).abs())</lang>

Output:

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In addition to the java.lang.Math.pow() method, each numeric type works with the power operator (**), which can be invoked as an in-fix operator between two numbers:

<lang groovy>println 22**3.5</lang>

Output:

Power results are not defined for all possible pairs of operands. ~~Any power operation that does not have a result returns a 64-bit IEEE NaN (Not a Number) value.~~

Power results are not defined for all possible pairs of operands.

Any power operation that does not have a result returns a 64-bit IEEE NaN (Not a Number) value.

<lang groovy>println ((-22)**3.5)</lang>

Output:

Also note that at the moment (07:00, 19 March 2011 (UTC)) Groovy (1.7.7) gives a mathematically incorrect result for "0**0". ~~The correct result should be "NaN", but the Groovy operation result is "1".~~

Also note that at the moment (07:00, 19 March 2011 (UTC)) Groovy (1.7.7) gives a mathematically incorrect result for "0**0".

The correct result should be "NaN", but the Groovy operation result is "1".

=={{header|Haskell}}==

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[http://www.cs.arizona.edu/icon/library/src/procs/numbers.icn numbers provides floor and ceiling]

Sample output:

<pre>e=2.718281828459045

pi=3.141592653589793

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=={{header|jq}}==

The mathematical functions available in jq are defined as 0-arity filters, so to evaluate the sqrt of 4, one writes <tt>4|sqrt</tt>~~. In jq, "." refers to the output coming from the left in the pipeline~~.

The mathematical functions available in jq are defined as 0-arity filters, so to evaluate the sqrt of 4, one writes <tt>4|sqrt</tt>.

In jq, "." refers to the output coming from the left in the pipeline.

In the following, comments appear after the "#":<lang jq>

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:- end_object.

</lang>

Output:

<pre>

| ?- constants_and_functions::show.

e = 2.718281828459045

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2 ** -3.4 = 0.09473228540689989

yes

</~~lang~~>

</pre>

=={{header|Lua}}==

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</lang>

'''Output:'''

<pre>

Java Math constants & functions:

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(prinl (format (pow 3.0 4.0) *Scl)) # power</lang>

Output:

<pre>2.718281828459

3.141592653590

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echo $(( pow(x,y) )) # power</lang>

<pre>2.71828182845904524

3.14159265358979324

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] \ can be used for both reals & ints</lang>

Output:

<pre>

2.7182818284590500