Calculates a power of a floating-point number.
[Format]
#include <mathf.h>
float powf (float x, float y);
[Parameters]
x Value to be raised to a power
y Power value
[Return values]
Normal: Value of x raised to the power y
Abnormal: Domain error: Returns not-a-number.
[Remarks]
A domain error occurs if x is 0.0 and y is 0.0 or less, or if x is negative and y is not an integer.