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FACT()
Calculates faculty
Syntax
FACT( <nNumber> ) -> nFaculty
Arguments
<nNumber> number between 0 and 21
Returns
<nFaculty> the faculty of <nNumber>
Description
The function FACT() calculates the faculty to the integer given in <nNumber>. The faculty is defined as n! = 1*2*…*n and is often used in statistics. Note, that faculties above 21 are too big so that the function must return a -1.
Examples
? fact( 0 ) // --> 1
? fact( 1 ) // --> 1
? fact( 4 ) // --> 24
Tests
fact( 0 ) == 1
fact( 1 ) == 1
fact( 4 ) == 24
Compliance
FACT() is compatible with CT3’s FACT().
Platforms
All
Files
Source is math.c, library is libct.
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