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

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ trunc(), truncf(), truncl()                                                 │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

       No errors occur.

       glibc 2.1.  C99, POSIX.1-2001.

       Math library (libm, -lm)

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

       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.

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

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

ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)

Linux man-pages 6.9.1                              2024-05-02                                           trunc(3)

       C11, POSIX.1-2008.

#include<math.h>doubletrunc(doublex);floattruncf(floatx);longdoubletruncl(longdoublex);

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

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