Title: Convert octal to decimal
Use function OctToDec to convert number in octal format to decimat format. It is not very difficult, because 217 in octal is 2*8*8+1*8+7 in decimal format.
function OctToDec(OctStr: string): string;
var
DecNum: Real;
i: Integer;
Error: Boolean;
begin
DecNum:=0;
Error:=False;
for i:=Length(OctStr) downto 1 do
begin
if not (OctStr[i] in ['0','1','2','3','4','5','6','7']) then
begin
Error:=True;
ShowMessage('This is not octal number');
Break;
end;
DecNum:=DecNum+StrToInt(OctStr[i])*Power(8, Length(OctStr)-i);
end;
if not Error then
Result:=FloatToStr(DecNum)
else Result:='';
end;