The usage of anonymous enums

Question

What is the purpose of anonymous enum declarations such as:

enum { color = 1 };

Why not just declare int color = 1

Answer 1

When you use
enum {color = 1}
you're not using any memory it's like
#define color 1

If you declare a variable
int color=1 Then you're taking up memory for a value that's not to be changed.