[edit]Parameters

[edit]Return value

If no errors occur, the nearest integer value not greater in magnitude thanarg (in other words,arg rounded towards zero), is returned.

Return value

Argument

[edit]Error handling

Errors are reported as specified inmath_errhandling.

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

• The currentrounding mode has no effect.
• Ifarg is ±∞, it is returned, unmodified.
• Ifarg is ±0, it is returned, unmodified.
• Ifarg is NaN, NaN is returned.

[edit]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 (includingintmax_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));}

trunc(+2.7) = +2.0trunc(-2.7) = -2.0trunc(-0.0) = -0.0trunc(-Inf) = -inf

[edit]References

[edit]See also

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