modf, modff, modfl - split floating-point number into integral and fractional parts

Syntax	#include <math.h> double modf(double x, double *iptr); float modff(float x, float *iptr); long double modfl(long double x, long double *iptr);
Description	These functions split a floating-point number x into its integral and fractional parts. Both parts receive the sign of x. The functions return the fractional part of x as the result and writes the integral part as a floating-point value to the address to which iptr points.
Return val.	Fractional part of x with the sign of x
Notes	The iptr argument must be a pointer!
See also	frexp(), ldexp(), trunc(), math.h.