uses System.SysUtils;
var
SunIsStar, EarthIsStar: Boolean;
Str1, Str2: string;
begin
SunIsStar := True;
Str1 := BoolToStr(SunIsStar, True);
//str1 is 'True'
EarthIsStar := False;
//without UseBoolStrs: '-1' or '0'
Str2 := BoolToStr(EarthIsStar);
//str2 is '0'
WriteLn('str1 is ', Str1);
WriteLn('str2 is ', Str2);
end.