c, obj c enum without tag or identifier

Question

im learning cocos2d [open gl wrapper for objective C on iPhone], and now playing with sprites have found this in a example,

 enum {  
easySprite =   0x000000         


        

Answer 1

Usually, when you are creating an enum, you want to use it as a type (variable, method parameters etc.).

In this case, it's just a way how to declare integer constants. Since thay don't want to use the enum as type, the name is not necessary.

Edit: Hexadecimal numbers are commonly used when the integer is a binary mask. You won't see any operators like +,-,*,/ used with such a number, you'll see bitwise operators (!, &, |, ^).

Every digit in a hexadecimal number represents 4 bits. The whole number is a 32-bit integer and by writing it in hexadecimal in this case, you are saying that you are using only the last four bits and the other bits can be used for something else. This wouldn't be obvious from a decimal number.