Данный код "считает" до миллиона долларов. Поэкспериментируйте с ним - попробуйте "посчитать" до миллиарда, конвертировать ее в рубли или переделать ее для работы с русским языком. Только не забудьте прислать мне ваши решения!
unit uNum2Str;
// Possible enhancements
// Move strings out to resource files
// Put in a general num2str utility
interface
function Num2Dollars( dNum: double ) : String;
implementation
uses SysUtils;
function LessThan99( dNum: double ) : String; forward;
// floating point modulus
function FloatMod( i,j: double ): double;
begin
result := i - (Int(i/j) * j);
end;
function Hundreds( dNum: double ) : String;
var
workVar: double;
begin
if ( dNum < 100 ) or ( dNum > 999 ) then
raise Exception.Create( 'hundreds range exceeded' );
result := '';
workVar := Int( dNum / 100 );
if workVar > 0 then
result := LessThan99(workVar) + ' Hundred';
end; function OneToNine( dNum: Double ) : String;
begin
if ( dNum < 1 ) or (dNum > 9 ) then
raise exception.create( 'onetonine: value out of range' );
result := 'woops';
if dNum = 1 then result := 'One'
else if dNum = 2 then result := 'Two'
else if dNum = 3 then result := 'Three'
else if dNum = 4 then result := 'Four'
else if dNum = 5.0 then result := 'Five'
else if dNum = 6 then result := 'Six'
else if dNum = 7 then result := 'Seven'
else if dNum = 8 then result := 'Eight'
else if dNum = 9 then result := 'Nine';
end;
function ZeroTo19( dNum: double ) : String;
begin
if (dNum < 0) or (dNum > 19) then
raise Exception.Create( 'Bad value in dNum' );
result := '';
if dNum = 0 then result := 'Zero'
else if (dNum <= 1) and (dNum >= 9) then result := OneToNine( dNum )
else if dNum = 10 then result := 'Ten'
else if dNum = 11 then result := 'Eleven'
else if dNum = 12 then result := 'Twelve'
else if dNum = 13 then result := 'Thirteen'
else if dNum = 14 then result := 'Fourteen'
else if dNum = 15 then result := 'Fifteen'
else if dNum = 16 then result := 'Sixteen'
else if dNum = 17 then result := 'Seventeen'
else if dNum = 18 then result := 'Eighteen'
else if dNum = 19 then result := 'Nineteen'
else result := 'woops!';
end;
function TwentyTo99( dNum: double ) : String;
var
BigNum: String;
begin
if ( dNum < 20 ) or ( dNum > 99 ) then
raise exception.Create( 'TwentyTo99: dNum out of range!' );
BigNum := 'woops';
if dNum >= 90 then BigNum := 'Ninety'
else if dNum >= 80 then BigNum := 'Eighty'
else if dNum >= 70 then BigNum := 'Seventy'
else if dNum >= 60 then BigNum := 'Sixty'
else if dNum >= 50 then BigNum := 'Fifty'
else if dNum >= 40 then BigNum := 'Forty'
else if dNum >= 30 then BigNum := 'Thirty'
else if dNum >= 20 then BigNum := 'Twenty';
// lose the big num
dNum := FloatMod( dNum, 10 );
if dNum > 0.00 then
result := BigNum + ' ' + OneToNine( dNum )
else
result := BigNum;
end;
function LessThan99( dNum: double ) : String;
begin
if dNum <= 19 then
result := ZeroTo19(dNum)
else
result := TwentyTo99(dNum);
end;
function Num2Dollars( dNum: double ) : String;
var
centsString: String;
cents: double;
workVar: double;
begin
result := '';
if dNum < 0 then
raise Exception.Create( 'Negative numbers not supported' );
if dNum > 999999999.99 then
raise Exception.Create( 'Num2Dollars only supports up to the millions at this point!' );
cents := (dNum - Int( dNum )) * 100.0;
if cents = 0.0 then
centsString := 'and 00/100 Dollars'
else if cents < 10 then
centsString := Format( 'and 0%1.0f/100 Dollars', [cents] )
else
centsString := Format( 'and %2.0f/100 Dollars', [cents] );
dNum := Int( dNum - (cents / 100.0) ); // lose the cents
// deal with million's
if (dNum >= 1000000 ) and ( dNum <= 999999999 ) then
begin
workVar := dNum / 1000000;
workVar := Int( workVar );
if (workVar <= 9) then
result := ZeroTo19(workVar)
else if ( workVar <= 99 ) then
result := LessThan99( workVar )
else if ( workVar <= 999 ) then
result := Hundreds( workVar )
else
result := 'mill fubar';
result := result + ' Million';
dNum := dNum - ( workVar * 1000000 );
end;
// deal with 1000's
if (dNum >= 1000 ) and ( dNum <= 999999.99 ) then
begin
// doing the two below statements in one line of code yields some really
// freaky floating point errors
workVar := dNum/1000;
workVar := Int( workVar );
if (workVar <= 9) then
result := ZeroTo19(workVar)
else if ( workVar <= 99 ) then
result := LessThan99( workVar )
else if ( workVar <= 999 ) then
result := Hundreds( workVar )
else
result := 'thou fubar';
result := result + ' Thousand';
dNum := dNum - ( workVar * 1000 );
end;
// deal with 100's
if (dNum >= 100.00 ) and (dNum <= 999.99) then
begin
result := result + ' ' + Hundreds( dNum );
dNum := FloatMod( dNum, 100 );
end;
// format in anything less than 100
if ( dNum > 0) or ((dNum = 0) and (Length( result ) = 0)) then
begin
result := result + ' ' + LessThan99( dNum );
end;
result := result + ' ' + centsString;
end;
end.