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34 lines
473 B
Plaintext
34 lines
473 B
Plaintext
NAME
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fact - factorial
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SYNOPSIS
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fact(x)
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TYPES
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x int
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return int
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DESCRIPTION
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Return the factorial of a number. Factorial is defined as:
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x! = 1 * 2 * 3 * ... * x-1 * x
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0! = 1
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EXAMPLE
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> print fact(10), fact(5), fact(2), fact(1), fact(0)
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3628800 120 2 1 1
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> print fact(40)
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815915283247897734345611269596115894272000000000
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LIMITS
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2^24 > x >= 0
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y < 2^24
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LIBRARY
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void zfact(NUMBER x, *ret)
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SEE ALSO
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comb, perm
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