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Fractions: add an example program.

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@4393 8e941d3f-bd1b-0410-a28a-d453659cc2b4
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lazarus-bart 2015-11-18 15:27:37 +00:00
parent 0f8ef4176e
commit 25c324f705
1 changed files with 44 additions and 0 deletions
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components/fractions/example.lpr Normal file
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program example;
{$mode objfpc}{$H+}
{$apptype console}
uses
Classes, sysutils, fractions, math;
var
F1, F2: TFraction;
D, Prec: Double;
i: Integer;
begin
F1 := Fraction(1,1,3); // 1 1/3
F2 := Fraction(4,3); // 4/3
writeln('F1.ToString = ',F1.ToString); // '4/3'
writeln('F1.Resolve = ',F1.Resolve); // '1 1/3'
writeln('F1.ToFloat = ',F1.ToFloat:16:16); // 1.3333333333333333
writeln('F2.ToString = ',F2.ToString); // '4/3'
writeln('(F1 = F2) = ',F1=F2); //True
F1 := Fraction(1,2);
F2 := Fraction(1,3);
writeln(F1.ToString,' * ',F2.ToString,' = ',(F1*F2).Resolve); // '1/6'
writeln(F1.ToString,' / ',F2.ToString,' = ',(F1/F2).Resolve); // '1 1/2'
writeln(F1.ToString,' + ',F2.ToString,' = ',(F1+F2).Resolve); // '5/6'
writeln(F1.ToString,' - ',F2.ToString,' = ',(F1-F2).Resolve); // '1/6'
writeln(F1.ToString,' ** 2 = ',(F1**2).Resolve); // '1/6'
D := 0.25;
F1 := FloatToFraction(D, 0.000001);
writeln('FloatTofraction(0.25) -> ',F1.ToString); // '1/4'
writeln;
writeln('Approximations of Pi:');
writeln(' [Pi = ',Pi:16:16,']');
Prec := 1.0;
for i := 1 to 10 do
begin
Prec := Prec / 10;
F2 := FloatTofraction(Pi, Prec);
writeln('FloatTofraction(Pi,',Prec:10:10,') = ',Format('%-13s',[F2.Resolve]),' [',F2.ToFloat:16:16,']');
end;
end.