November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Overflow checking
The Overflow checking option regulates whether the compiler checks if certain arithmetic operations (+, -, *, Abs, Sqr, Inc, Dec, Succ, and Pred) produce a number that is too large or too small to fit into the data type. You can use compiler options, {$OVERFLOWCHECKS ON} and {$OVERFLOWCHECKS OFF} (or short forms {$Q+} and {$Q-}), to turn this option on and off in a specific part of a program.
For example, the following program will silently increment $FFFFFFFF to 0 in the first Inc statement but will raise EIntOverflow exception in the second Inc statement:
procedure TfrmCompilerOptions.btnOverflowErrorClick(Sender: TObject);var i: cardinal;begin {$Q-} i := $FFFFFFFF; // Without overflow checks, Inc will work and i will ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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