float truncf( float arg );
(1) (since C99)double trunc( double arg );
(2) (since C99)long double truncl( long double arg );
(3) (since C99)#define trunc( arg )
(4) (since C99)1-3) Computes the nearest integer not greater in magnitude than arg.
4) Type-generic macro: If arg has type long double, truncl is called. Otherwise, if arg has integer type or the type double, trunc is called. Otherwise, truncf is called.
If no errors occur, the nearest integer value not greater in magnitude than arg (in other words, arg rounded towards zero), is returned.
Return value
Argument
[edit] Error handlingErrors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559):
FE_INEXACT may be (but isn't required to be) raised when truncating a non-integer finite value.
The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows on its own; however the result may overflow any integer type (including intmax_t), when stored in an integer variable.
The implicit conversion from floating-point to integral types also rounds towards zero, but is limited to the values that can be represented by the target type.
[edit] Example#include <math.h>
#include <stdio.h>
int main(void)
{
printf("trunc(+2.7) = %+.1f\n", trunc(+2.7));
printf("trunc(-2.7) = %+.1f\n", trunc(-2.7));
printf("trunc(-0.0) = %+.1f\n", trunc(-0.0));
printf("trunc(-Inf) = %+f\n", trunc(-INFINITY));
}
Possible output:
trunc(+2.7) = +2.0 trunc(-2.7) = -2.0 trunc(-0.0) = -0.0 trunc(-Inf) = -inf[edit] References
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