Accessing enum members...

[dissectcode]

Hi - I am seeing enum members being used, with just the member's name, and not the enum name.

for example:

typedef enum Fruit
{
  Apple = 0,
  Orange,
  Banana = 0xFF
} FruitIndex;


int arrayInt[Orange]
{
  more code here.....
}

Question 1 - Is Orange's index = 1 ??
Question 2 - what do you think the 0xFF hex is fox??
QUESTION 3 - in the array - why don't I have to put [FruitIndex.Oran ge] to access the member??

thanks!

[Laharl]

Since this looks like a homework question, I'll answer Socratically.

1: Print it out and find out.
2: I don't know, what is it for? The answer to 1 might help.
3: Is there anything else that the name Orange would conflict with?

[dissectcode]

It is NOT a homework question. I am actually stuck with this at work! Please help someone...

I just wrote that example code as a simple piece but it is NOT homework.

[Laharl]

Oh, I see. Regardless, the answer to 3 is still fine as far as I know. If there's anything else called Orange, you need to qualify it. If there isn't, you don't to the best of my knowledge. To 1, I don't know offhand, you should print out the value and find out. And for 2, I really don't know, maybe somebody needed the last value to be 255 for whatever reason. You're gonna have to dig around in the other code to answer some of these, I expect.

[Banfa]

And for 2, I really don't know, maybe somebody needed the last value to be 255 for whatever reason. You're gonna have to dig around in the other code to answer some of these, I expect.

Or since this is work all you have to do is look in the project documentation where such a decision will be clearly given with the reason for the decision.

[weaknessforcats]

OK. The enum Fruit is a type.
[code=cpp]

Fruit var1 = Orange;
Fruit var2 = Banana;
[/code]

The value represented by Orange is 1 and the value represented by Banana is 0xFF.

However:
[code=cpp]
Fruit var1 = 1; //ERROR
Fruit var2 = 0xFF //ERROR
[/code]

Even though Orange represents 1 it is really Fruit::Orange and that 1 is an int. Now you will get a compiler error saying it's not possible to convert an int to a Fruit. Ditto for var2.

Should you do a typecast:
[code=cpp]
Fruit var1 = (Fruit)1; //ERROR
Fruit var2 = (Fruit)0xFF //ERROR
[/code]

the compiler errors will go away but the results will be indeterminate. That is, don't do this. Also don't:
[code=cpp]
Fruit var3 = (Fruit)456; //REALLY MAJOR ERROR
[/code]

This is also indeterminate.