modf() and modff()

  #include <math.h>

  

  double modf(double x, double *i);

  

  float  modff(float x, float *i);

  

modf() splits the floating-point number x into an integral part (returned in *i) and a fractional part. Both parts have the same sign as x.

The fractional part of x.

floor() and floorf(),

fmod() and fmodf(),

frexp() and frexpf(), and

ldexp() and ldexpf()