NAME
modf, modff, modfl - extract signed integral and fractional values from
floating-point number SYNOPSIS
#include
double modf(double x, double *iptr); float modff(float x, float *iptr); long double modfl(long double x, long double *iptr); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): modf(), modfl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 200112L;
or cc -std=c99 DESCRIPTION The modf() function breaks the argument x into an integral part and a fractional part, each of which has the same sign as x. The integral part is stored in the location pointed to by iptr. RETURN VALUE The modf() function returns the fractional part of x. If x is a NaN, a NaN is returned, and *iptr is set to a NaN.
If x is positive infinity (negative infinity), +0 (-0) is returned, and *iptr is set to positive infinity (negative infinity). ERRORS No errors occur. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤
│modf(), modff(), modfl() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘ CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89. SEE ALSO frexp(3), ldexp(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2013-06-21 MODF(3)