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FREXP(3)                   Linux Programmer's Manual                  FREXP(3)



NAME
       frexp, frexpf, frexpl - convert floating-point number to fractional and integral components

SYNOPSIS
       #include <math.h>

       double frexp(double x, int *exp);
       float frexpf(float x, int *exp);
       long double frexpl(long double x, int *exp);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       frexpf(), frexpl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
       The  frexp()  function is used to split the number x into a normalized fraction and an exponent which is stored
       in exp.

RETURN VALUE
       The frexp() function returns the normalized fraction.  If the argument x is not zero, the  normalized  fraction
       is x times a power of two, and its absolute value is always in the range 1/2 (inclusive) to 1 (exclusive), that
       is, [0.5,1).

       If x is zero, then the normalized fraction is zero and zero is stored in exp.

       If x is a NaN, a NaN is returned, and the value of *exp is unspecified.

       If x is positive infinity (negative infinity), positive infinity (negative infinity) is returned, and the value
       of *exp is unspecified.

ERRORS
       No errors occur.

CONFORMING TO
       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

EXAMPLE
       The program below produces results such as the following:

           $ ./a.out 2560
           frexp(2560, &e) = 0.625: 0.625 * 2^12 = 2560
           $ ./a.out -4
           frexp(-4, &e) = -0.5: -0.5 * 2^3 = -4

   Program source

       #include <math.h>
       #include <float.h>
       #include <stdio.h>
       #include <stdlib.h>

       int
       main(int argc, char *argv[])
       {
           double x, r;
           int exp;

           x = strtod(argv[1], NULL);
           r = frexp(x, &exp);

           printf("frexp(%g, &e) = %g: %g * %d^%d = %g\n",
                  x, r, r, FLT_RADIX, exp, x);
           exit(EXIT_SUCCESS);
       } /* main */

SEE ALSO
       ldexp(3), modf(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                  2008-10-29                          FREXP(3)