unit TU2.Helper.Currency;
interface
function CurrencyToChineseCapitalCharacter(const AValue: Currency; const ADecimals: Cardinal=4): string;
function CurrencyToString(const AValue: Currency; const ADecimals: Cardinal=4): string;
implementation
uses System.SysUtils, System.Math;
function CurrencyRound(var U: UInt64; const ADecimals: Cardinal): Integer; inline;
var
W: UInt64;
begin//Bankers-rounding
Result := 4-ADecimals;
if Result<0 then
Result := 0
else if Result>0 then
begin
case Result of
1:begin //li
DivMod(U, 10, U, W);
if (W > 5) or ((W = 5) and Odd(U)) then
Inc(U);
end;
2:begin //fen
DivMod(U, 100, U, W);
if (W > 50) or ((W = 50) and Odd(U)) then
Inc(U);
end;
3:begin //jiao
DivMod(U, 1000, U, W);
if (W > 500) or ((W = 500) and Odd(U)) then
Inc(U);
end;
4:begin //yuan
DivMod(U, 10000, U, W);
if (W > 5000) or ((W = 5000) and Odd(U)) then
Inc(U);
end;
end;
end;
end;
function CurrencyToChineseCapitalCharacter(const AValue: Currency; const ADecimals: Cardinal=4): string;
const//Currency: [-922337203685477.5807, 922337203685477.5807]
CCCNegative = '负';
CCCZheng = '整';
CCCNumbers: array[0..9] of Char = ('零','壹','贰','叁','肆','伍','陆','柒','捌','玖');
CCCUnits: array[0..18] of Char = ('毫', '厘', '分', '角', '元','拾','佰','仟','万',
'拾','佰','仟','亿','拾','佰','仟','万','兆','拾');
var
U, W: UInt64;
Digits, Idx, ZeroFlag: Integer;
Negative: Boolean;
Buff: array[0..38] of Char;
begin
U := PUInt64(@AValue)^;
if U <> 0 then
begin
Negative := (U and $8000000000000000) <> 0;
if Negative then
U := not U + 1;
Digits := CurrencyRound(U, ADecimals);
if U<>0 then
begin
//Try skip trailing zero
repeat
DivMod(U, 10, U, W);
Inc(Digits);
until W<>0;
Dec(Digits);
Idx := 38;
if Digits>=3 then
begin
Buff[Idx] := CCCZheng;
Dec(Idx);
if Digits>4 then
begin
Buff[Idx] := CCCUnits[4];
Dec(Idx);
if Digits>17 then
begin
Buff[Idx] := CCCUnits[17];
Dec(Idx);
end else if Digits>12 then
begin
Buff[Idx] := CCCUnits[12];
Dec(Idx);
end else if Digits>8 then
begin
Buff[Idx] := CCCUnits[8];
Dec(Idx);
end;
end;
end;
Buff[Idx] := CCCUnits[Digits];
Dec(Idx);
Buff[Idx] := CCCNumbers[W];
Dec(Idx);
//Do Split
ZeroFlag := 0;
while U<>0 do
begin
Inc(Digits);
DivMod(U, 10, U, W);
if Digits in [4,8,12,17] then
begin
if ZeroFlag>0 then
begin
Buff[Idx] := CCCNumbers[0];
Dec(Idx);
end else if (ZeroFlag<0) and (Digits>8) then
Inc(Idx);
Buff[Idx] := CCCUnits[Digits];
Dec(Idx);
if W<>0 then
begin
Buff[Idx] := CCCNumbers[W];
Dec(Idx);
ZeroFlag := 0;
end else
ZeroFlag := -1;
end else begin
if W<>0 then
begin
if ZeroFlag>0 then
begin
Buff[Idx] := CCCNumbers[0];
Dec(Idx);
end;
Buff[Idx] := CCCUnits[Digits];
Dec(Idx);
Buff[Idx] := CCCNumbers[W];
Dec(Idx);
ZeroFlag := 0;
end else begin
if ZeroFlag=0 then
ZeroFlag := 1;
end;
end;
end;
if Negative then
Buff[Idx] := CCCNegative
else Inc(Idx);
//Copy Result
Digits := 38+1-idx;
SetLength(Result, Digits);
Move(Buff[idx], PChar(Result)^, Digits * SizeOf(WideChar));
Exit;
end;
end;
Result := CCCNumbers[0]+CCCUnits[4]+CCCZheng;
end;
function CurrencyToString(const AValue: Currency; const ADecimals: Cardinal=4): string;
const
NegativeChar = '-';
DecimalDotChar = '.';
var
U: UInt64;
Digits: Integer;
Negative: Boolean;
begin
U := PUInt64(@AValue)^;
Negative := (U and $8000000000000000) <> 0;
if Negative then
U := not U + 1;
Digits := CurrencyRound(U, ADecimals);
Result := UIntToStr(U);
if Digits<4 then
Result := Result.Insert(Result.Length+Digits-4, DecimalDotChar);
if Negative then
Result := NegativeChar + Result;
end;
end.
在Delphi中，为了实现货币数值运算中的严格精度要求，内部把货币类型数据当作一个放大10000倍的64位整数来处理。这样根据64位整数的范围，可以得出货币类型Currency的范围是 [-922337203685477.5807; 922337203685477.5807]。
货币类型一个最常见的应用场景是金额大写转换，网上都是一些先将货币转字符串后再对字符串处理的代码，而且有些方法在有些情况下不满足金额大写规范，这里给出一个直接转换的方法。
以上为作者原文内容，我对CurrencyToChineseCapitalCharacter函数在Android及Windows10上做了测试，结果正常。Delphi 版本10.3.2.感谢作者的分享！这是一个最有效率的实现方法！
function NumberToChineseCapitalCharacter(const AValue: Extended; const ADecimals: Cardinal = 4): string;
begin
result := CurrencyToChineseCapitalCharacter(AValue, ADecimals);
if Result.IndexOfAny(['角', '分', '厘','毫'], 0) <> -1 then
begin
if result.IndexOf('元')<>-1 then
Result := Result.Replace('元', '点').Replace('角', '').Replace('分', '').Replace('厘', '').Replace('毫','')
else
Result:='零点'+ Result.Replace('角', '').Replace('分', '').Replace('厘', '').Replace('毫','')
end
else
Result := Result.Replace('元整', '');
end;
发表于 2019-9-12 10:31:00