__pow_i() — Raise to a power (R**I)

Standards

Standards / Extensions	C or C++	Dependencies
Language Environment	both	z/OS® V1R7

Format

#include <math.h>

double __pow_i(double x, int y);

General description

The __pow_i() function calculates the value of x to the power of y and is a C interface to the Language Environment Math Service CEESDXPI. Information about the Language Environment math service CEESDXPI can be found in the following publications:

Note: The following table shows the viable formats for these functions. See IEEE binary floating-point for more information about IEEE Binary Floating-Point.

Function	Hex	IEEE
__pow_i	X	X

Returned value

If successful, __pow_i() returns the value of x to the power of y.

If...	Then...
x is not equal to 0 and y is 0	1 is returned.
x is 0 and y is positive	0 is returned.
x and y are 0	0 is returned and errno is set to EDOM.
x is 0 and y is negative	±HUGE_VAL is returned and errno is set to EDOM.
x and y cause an overflow	HUGE_VAL is returned.

Related information

__pow_ii() — Raise to a power (I**I)