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trunc, truncf, truncl

Defined in header <math.h> 
float       truncf( float arg );
-		 (1) (since C99) 
double      trunc( double arg );
-		 (2) (since C99) 
long double truncl( long double arg );
-		 (3) (since C99)
Defined in header <tgmath.h> 
#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.

Parameters

- -
arg - floating point value

Return value

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
math-trunc.svg
Argument

Error handling

Errors are reported as specified in math_errhandling.

-

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

-

Notes

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.

-

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

References

See also

- - - -
-
(C99)(C99)
 computes largest integer not greater than the given value
(function)
-
(C99)(C99)
 computes smallest integer not less than the given value
(function)
-
(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)
 rounds to nearest integer, rounding away from zero in halfway cases
(function)
C++ documentation for trunc
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/trunc -

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