FREXP(3) BSD Library Functions Manual FREXP(3)

NAME
     ffrreexxpp - break floating-point number into normalized fraction and power
     of 2

SYNOPSIS
     ##iinncclluuddee <>

     double
     ffrreexxpp(double value, int *exp);

     long double
     ffrreexxppll(long double value, int *exp);

     float
     ffrreexxppff(float value, int *exp);

DESCRIPTION
     The ffrreexxpp() functions break the floating-point number value into a nor-
     malized fraction and an integral power of 2. They store the integer in
     the int object pointed to by exp.

     The functions return a number x such that x has a magnitude in the inter-
     val [1/2, 1) or 0, and value = x*(2**exp).

SSPPEECCIIAALL VVAALLUUEESS
     ffrreexxpp(+-0, exp) returns +-0, and stores 0 in the object pointed to by
     exp.

     ffrreexxpp(+-infinity, exp) returns +-infinity, and stores an unspecified
     value in the object pointed to by exp.

     ffrreexxpp(Nan, exp) returns a Nan, and stores an unspecified value in the
     object pointed to by exp.

SEE ALSO
     math(3), scalbn

STANDARDS     The ffrreexxpp() functions conform to ISO/IEC 9899:1999(E).

BSD                            January 30, 2003                            BSD