pow() and powf()

  #include <math.h>

  

  double pow (double x, double y);

  

  float  powf(float x, float y);

  

pow() computes x to the power of y, i.e., xy.

xy, if x > 0

1, if y == 0

+×, if ( x == 0 && y < 0)

NAN, if ( x < 0 && y is not integral). Also, errno is set to EDOM.

±×, with the same sign as x, if the result is too large.

exp() and expf(),

ldexp() and ldexpf(),

log() and logf(), and

modf() and modff()