This compiles:
enum states { STATE_1, STATE_2, STATE_3, STATE_4, STATE_5, STATE_6, MAX_STATES };
states state;
void setup ()
{
} // end of setup
void loop ()
{
switch (state)
{
case STATE_1 :
// if this does that, do something
state = STATE_2;
break;
case STATE_2:
// if this does that, do something
state = STATE_3;
break;
} // end of switch
} // end of loop