usr/man/mano/exp.3m

.\"     @(#)exp.3m      6.2 (Berkeley) 6/6/85
.\"
.TH EXP 3M  "June 6, 1985"
.AT 3
.SH NAME
exp, log, log10, pow, sqrt \- exponential, logarithm, power, square root
.SH SYNOPSIS
.nf
.B #include <math.h>
.PP
.B double exp(x)
.B double x;
.PP
.B double log(x)
.B double x;
.PP
.B double log10(x)
.B double x;
.PP
.B double pow(x, y)
.B double x, y;
.PP
.B double sqrt(x)
.B double x;
.fi
.SH DESCRIPTION
.I Exp
returns the exponential function of
.I x.
.PP
.I Log
returns the natural logarithm of
.IR x ;
.I log10
returns the base 10 logarithm.
.PP
.I Pow
returns
.if n \
.I x**y.
.if t \
.I  x\u\s8y\s10\d.
.PP
.I Sqrt
returns the square root of
.I x.
.SH SEE ALSO
hypot(3M),
sinh(3M),
intro(3M)
.SH DIAGNOSTICS
.I Exp
and
.I pow
return a huge value when the correct value would overflow;
.I errno
is set to ERANGE.
.I Pow
returns 0 and sets
.I errno
to EDOM when the first argument is negative and the second is non-integral or
when first argument is 0 and the second is less than or equal to 0.
.PP
.I Log
returns 0 when
.I x
is zero or negative;
.I errno
is set to EDOM.
.PP
.I Sqrt
returns 0 when
.I x
is negative;
.I errno
is set to EDOM.