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MulDiv:

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- use math rounding instead of bank rounding (by Grzegorz Zakrzewski)
- return -1 if Denominator is 0 (as winapi do)
(issue #0009934)

git-svn-id: trunk@12831 -
This commit is contained in:
paul 2007-11-12 02:15:05 +00:00
parent f007970067
commit 07d4573f3a
1 changed files with 14 additions and 2 deletions
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16
lcl/lcltype.pp
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@ -2564,6 +2564,7 @@ type
function HiWord(i: integer): word; function HiWord(i: integer): word;
function LoWord(i: integer): word; function LoWord(i: integer): word;
Function Char2VK(C : Char) : Word; Function Char2VK(C : Char) : Word;
function MathRound(AValue: ValReal): Int64;
function MulDiv(nNumber, nNumerator, nDenominator: Integer): Integer; function MulDiv(nNumber, nNumerator, nDenominator: Integer): Integer;
function KeyToShortCut(const Key: Word; const Shift: TShiftState): TShortCut; function KeyToShortCut(const Key: Word; const Shift: TShiftState): TShortCut;
function CharSetToString(const Charset: Integer): String; function CharSetToString(const Charset: Integer): String;
@ -2583,7 +2584,7 @@ begin
Result:=Lo(i); Result:=Lo(i);
end; end;
Function Char2VK(C : Char) : Word; function Char2VK(C : Char) : Word;
begin begin
Case C of Case C of
'0'..'9' :Result := VK_0 + Ord(C) - Ord('0'); '0'..'9' :Result := VK_0 + Ord(C) - Ord('0');
@ -2594,9 +2595,20 @@ begin
end; end;
end; end;
function MathRound(AValue: ValReal): Int64; inline;
begin
if AValue >= 0 then
Result := Trunc(AValue + 0.5)
else
Result := Trunc(AValue - 0.5);
end;
function MulDiv(nNumber, nNumerator, nDenominator: Integer): Integer; function MulDiv(nNumber, nNumerator, nDenominator: Integer): Integer;
begin begin
Result:=Round(int64(nNumber)*int64(nNumerator) / nDenominator); if nDenominator = 0 then
Result := -1
else
Result := MathRound(int64(nNumber) * int64(nNumerator) / nDenominator);
end; end;
function KeyToShortCut(const Key: Word; const Shift: TShiftState): TShortCut; function KeyToShortCut(const Key: Word; const Shift: TShiftState): TShortCut;