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21.2.11 Arithmetic Functions

— 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 towards zero.

— 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).