TRUNC(3) BSD Library Functions Manual TRUNC(3)NAME
trunc -- truncate to integer value
The trunc() and truncf() functions return the integral value nearest to but no larger in magnitude than x.
trunc(+-0) returns +-0.
trunc(+-infinity) returns +-infinity.
SEE ALSO ceil(3), ieee(3), rint(3), math(3)STANDARDS
The trunc() and truncf() functions conform to ISO/IEC 9899:1999(E).
BSD January 29, 2003 BSD
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TRUNC(3) Linux Programmer's Manual TRUNC(3)NAME
trunc, truncf, truncl - round to integer, toward zero
double trunc(double x);
float truncf(float x);
long double truncl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
trunc(), truncf(), truncl():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
These functions round x to the nearest integer not larger in absolute value.
These functions return the rounded integer value.
If x is integral, infinite, or NaN, x itself is returned.
No errors occur.
These functions first appeared in glibc in version 2.1.
Multithreading (see pthreads(7))
The trunc(), truncf(), and truncl() functions are thread-safe.
The integral value returned by these functions may be too large to store in an integer type (int, long, etc.). To avoid an overflow, which
will produce undefined results, an application should perform a range check on the returned value before assigning it to an integer type.
SEE ALSO ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(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/.
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