modf

modf, modff, modfl - extract signed integral and fractional values from floating-point number

#include <math.h>
 I double modf(double  x , double * iptr );

I float modff(float  x , float * iptr );

I long double modfl(long double  x , long double * iptr );

Link with -lm.

The R modf () function breaks the argument x into an integral part and a fractional part, each of which has the same sign as x. The integral part is stored in iptr.

The R modf () function returns the fractional part of x.

SVr4, 4.3BSD, C89. The float and long double variants are C99 requirements.

frexp(3), ldexp(3)