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10.6. Replacing Simple Macros

If you are thinking that a const int global variable could replace a simple #define you are right. const variables have some advantages, one small advantage is that you can get their address when you need to pass around a pointer to their value, in this way they are more flexible than macros. If you don't take the address of the const variable then GCC can optimise it to a level similar to a #define.

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