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from: @(#)exp.3 6.12 (Berkeley) 7/31/91
$FreeBSD: src/lib/msun/man/exp.3,v 1.24 2008/01/18 21:43:00 das Exp $
$NetBSD: exp.3,v 1.33 2024/01/26 19:27:30 nros Exp $
.Dd January 24, 2024 .Dt EXP 3 .Os .Sh NAME .Nm exp , .Nm expf , .Nm expl , The sorting error is intentional. exp and expf should be adjacent.
.Nm exp2 , .Nm exp2f , .Nm exp2l , .Nm expm1 , .Nm expm1f .Nm expm1l .Nd exponential functions .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn exp "double x" .Ft float .Fn expf "float x" .Ft long double .Fn expf "long double x" .Ft double .Fn exp2 "double x" .Ft float .Fn exp2f "float x" .Ft long double .Fn exp2l "long double x" .Ft double .Fn expm1 "double x" .Ft float .Fn expm1f "float x" .Ft long double .Fn expm1l "long double x" .Sh DESCRIPTION The .Fn exp , .Fn expf , and .Fn expl functions compute the base .Ms e exponential value of the given argument .Fa x .
p The .Fn exp2 , .Fn exp2f , and .Fn exp2l functions compute the base 2 exponential of the given argument .Fa x .
p The .Fn expm1 , .Fn expm1f and .Fn expm1l functions compute the value exp(x)-1 accurately even for tiny argument .Fa x . .Sh RETURN VALUES These functions will return the appropriate computation unless an error occurs or an argument is out of range. The functions .Fn exp and .Fn expm1 detect if the computed value will overflow, set the global variable .Va errno to .Er ERANGE and cause a reserved operand fault on a .Tn VAX . .Sh SEE ALSO .Xr math 3 .Sh STANDARDS The .Fn exp function conforms to .St -ansiC . The .Fn exp2 , .Fn exp2f , .Fn exp2l , .Fn expf , .Fn expl , .Fn expm1 , .Fn expm1f , and .Fn expm1l functions conform to .St -isoC-99 . .Sh HISTORY The .Fn exp functions appeared in .At v1 . The .Fn expm1 function appeared in x 4.3 .