Man page - truncf(3)

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Manual

trunc

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
NOTES
SEE ALSO

NAME

trunc, truncf, truncl - round to integer, toward zero

LIBRARY

Math library ( libm , -lm )

SYNOPSIS

#include <math.h>

double trunc(double x );
float truncf(float x );
long double truncl(long double x );

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

trunc (), truncf (), truncl ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

These functions round x to the nearest integer value that is not larger in magnitude than x .

RETURN VALUE

These functions return the rounded integer value, in floating format.

If x is integral, infinite, or NaN, x itself is returned.

ERRORS

No errors occur.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

C11, POSIX.1-2008.

HISTORY

glibc 2.1. C99, POSIX.1-2001.

NOTES

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)