modf - Decomposes its argument into fractional and integral part
double modf -> double double
2.5 modf -> 0.5 2
This is an interface to the C++ function
double std::modf(double, double*)
Stroustrup 3rd ed p 661
Diesmann
17.5.2005
/var/www/debian/nest/nest-simulator-2.20.0/sli/slimath.cc