Why do people use enums in C++ as constants while they can use const?

Question

Why do people use enums in C++ as constants when they can use const?

Answer 1

Before compiler vendors implemented the ISO/IEC 14882:1998 C++ standard, this code to define a constant in a class scope resulted in a compile error:

class Foo {
    static const int MAX_LEN = 80;
    ...
};

If the constant is an integer type, a kludgy work around is define it in an enum inside the class:

class Foo {
    enum {
        MAX_LEN = 80
    };
    ...
};