Enums

An enum is a named set of integer constants. Values default to 0, 1, 2… but you can pin them.

enum state {
    STATE_IDLE,
    STATE_RUNNING,
    STATE_DONE = 9
};

enum state s = STATE_IDLE;

Enum constants are int; C23 lets the operator pin a narrower underlying type.

References

• Unions for the typical tag-plus-union pairing.

• Primitives for the underlying int.