NAME
pow,
powf —
power
functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
pow(
double
x,
double y);
float
powf(
float
x,
float y);
DESCRIPTION
The
pow() family of functions returns
x
raised to the power of
y.
If
x is negative and
y is not an
integer, the global variable
errno is set to
EDOM
, and on VAX a reserved operand fault is
generated. A portable application should nevertheless ensure that
y is an integer value whenever
x
is negative.
RETURN VALUES
Upon successful completion, the described functions return
x^y.
SEE ALSO
exp(3),
log(3)
STANDARDS
The described functions conform to
ISO/IEC 9899:1999
(“ISO C99”).
HISTORY
The history of the power functions dates back to
Version 6
AT&T UNIX.