frexp - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEfrexp, frexpf, frexpl − convert floating-point number to fractional and integral components

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double frexp(double x, int *exp); float frexpf(float x, int *exp); long double frexpl(long double x, int *exp);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): frexpf(), frexpl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions are used to split the number x into a normalized fraction and an exponent which is stored in exp.

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RETURN VALUEThese functions return 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.

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ERRORSNo errors occur.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue frexp(), frexpf(), frexpl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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EXAMPLESThe 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

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Program source​ #include <float.h> #include <math.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); }

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SEE ALSOldexp(3), modf(3) 0

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