NAME    [Toc]    [Back]

     frexp - convert floating-point number to fractional and integral components

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double
     frexp(double value, int *exp);

DESCRIPTION    [Toc]    [Back]

     The frexp() function breaks a floating-point number into a normalized
     fraction and an integral power of 2.  It stores the integer in the int
     object pointed to by exp.

RETURN VALUES    [Toc]    [Back]

     The frexp() function returns the value x, such that x is a double with
     magnitude in the interval [1/2, 1) or zero, and value equals x times 2
     raised to the power *exp.  If value is zero, both parts of the result are
     zero.

SEE ALSO    [Toc]    [Back]

     ldexp(3), math(3), modf(3)

STANDARDS    [Toc]    [Back]

     The frexp() function conforms to ANSI X3.159-1989 (``ANSI C'').

BSD                              June 4, 1993                              BSD