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POW(3) |
Library Functions Manual |
POW(3) |
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 return
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.
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.
