Delphi in a Nutshell

Name

Trunc Function

Syntax

function Trunc(X: Floating-point type): Int64;

Description

The Trunc function truncates a floating-point value by discarding the fractional part (round towards zero). Unlike Int, Trunc returns an integer result. Trunc is not a real function.

Tips and Tricks

• The Trunc function temporarily sets the floating-point control word, then truncates the number, and restores the control word.

• If X is an integer, the compiler eliminates the call to Trunc and simply returns X.

• If X is a Variant, Delphi automatically converts it to a floating-point number and truncates it.

• The compiler does not accept an Int64 argument, but there is no reason to call Trunc for Int64.

• If X is infinity or NaN, Trunc reports runtime error 6 (EInvalidOp).

See Also

Int Function, Round Function