enum.c

enum State
{
    LOAD_DATA,
    MODIFY_DATA,
    SAVE_DATA,
    FUCK_YOU,
}

State state = LOAD_DATA;

///KOOOOD


switch(state)
{
    case LOAD_DATA:
        //load data
        break;
    case MODIFY_DATA:
        //modify data
        break;
    ...
}