indexing overload concept idea

**Trauts** · 05-16-2003

This is a little weird, but which of these makes the most sense for an indexing operator for type "int" (bear with me, I know this is weird)

Say your number is

classname x = 12345;

x[0] returns 1 (first digit when converted using itoa) and x[1] returns 2

or

x[0] returns 5 (ones place) and x[1] returns 4 (tens place)

or

x[0] returns positive/negative, x[1] returns 5 (ones place) and x[10] returns 4 (tens place)

The idea is you can get the digit in an int at a position... which makes the most sense / would be the most useful?

**ygfperson** · 05-16-2003

x[0] == ones column == 5
x[1] == tens column == 4
etc...

That would be easiest to implement. But it all depends on what you need it for. The first idea may be better if that's what you intended your class to do.

The third idea isn't good. Just have another member function return sign. That idea implies that the sign of the number is a digit; which isn't true.

**PorkyChop** · 05-16-2003

lol trauts, you are a wealth of curiousity. Too bad I am not a wealth of knowledge...

Anyway, I recently made a similar object where you could use the subscript operator to obtain an individual digit of an int. I chose to make index 0 the ones-place digit, because 10 to the 0 power is 1, and I chose to make index the tens-place digit, since 10 to the 1 power is 10, and so on...but that's just my opinion

I agree with ygf that you should jsut have a member that returns sign, or maybe overload a different operator(i don't know which one would be appropriate...bool maybe?)

**Trauts** · 05-16-2003

I agree with both of you.

I agree with you about the curiosity... I take up a project and I don't give up, even when I think its impossible... then I find a way that almost does it :-)

Hence the fact you'll notice most posts I've made in the past 2 months or so have been related to the "any" type, including this one :-)

**major_small** · 05-17-2003

if you don't need to do math with the numbers, just use char boxes in your string... if you do need math, you can create a converter to convert these char's into int's and then do the math, but that's a little more complicated than some other ways...

the way i suggested, the second two of your statements would work... you'd just have to check if x[0] was a '-' to make sure that x[1] is read as the 1's place... just shift everything down and make note of the negativity of the number somewhere...

**Eibro** · 05-17-2003

Originally posted by Trauts
I agree with both of you.

I agree with you about the curiosity... I take up a project and I don't give up, even when I think its impossible... then I find a way that almost does it :-)

Hence the fact you'll notice most posts I've made in the past 2 months or so have been related to the "any" type, including this one :-)

A stringstream would make this class implementation simple. Also, it'd be nice to have implicit conversion to an integer (via operator int()) or even explicit, as in a member function to_int() or something. Another thing to think about trying is make the class a template, that way it could accept any type with an overloaded istream << operator (for the stringstream)

**gustavosserra** · 05-18-2003

If I understood the problem, you could use int´s division.
I implemented a little class that uses this concept

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