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# (guile.info.gz) Arithmetic Info Catalog (guile.info.gz) Complex (guile.info.gz) Numbers (guile.info.gz) Scientific
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21.2.11 Arithmetic Functions
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-- Scheme Procedure: + z1 ...
Return the sum of all parameter values.  Return 0 if called
without any parameters.

-- Scheme Procedure: - z1 z2 ...
If called with one argument Z1, -Z1 is returned. Otherwise the sum
of all but the first argument are subtracted from the first
argument.

-- Scheme Procedure: * z1 ...
Return the product of all arguments.  If called without arguments,
1 is returned.

-- Scheme Procedure: / z1 z2 ...
Divide the first argument by the product of the remaining
arguments.  If called with one argument Z1, 1/Z1 is returned.

-- Scheme Procedure: abs x
-- C Function: scm_abs (x)
Return the absolute value of X.

X must be a number with zero imaginary part.  To calculate the
magnitude of a complex number, use `magnitude' instead.

-- Scheme Procedure: max x1 x2 ...
Return the maximum of all parameter values.

-- Scheme Procedure: min x1 x2 ...
Return the minimum of all parameter values.

-- Scheme Procedure: truncate
Round the inexact number X towards zero.

-- Scheme Procedure: round x
Round the inexact number X to the nearest integer.  When exactly
halfway between two integers, round to the even one.

-- Scheme Procedure: floor x
Round the number X towards minus infinity.

-- Scheme Procedure: ceiling x
Round the number X towards infinity.

For the `truncate' and `round' procedures, the Guile library exports
equivalent C functions, but taking and returning arguments of type
`double' rather than the usual `SCM'.

-- C Function: double scm_truncate (double x)
-- C Function: double scm_round (double x)

For `floor' and `ceiling', the equivalent C functions are `floor'
and `ceil' from the standard mathematics library (which also take and
return `double' arguments).

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