Generate code from automata
A simple way to do it is to just write an interpreter that follows the transition table. I.e., do something like (in C):

state = INITIAL;
symbol = get_next();
while(symbol != END) {
   state = table[state][symbol];
   symbol = get_next();
}
if(is_accepting(state))
   /* Accept */


Next simpler is to write a rat's nest of gotos, transferring among them according to the symbol at hand (each label in the program corresponds to a state of the automaton).

Writing a decently organized,structured program from an automaton is possible, but far from automatic (and it would take a fair amount of work to check it really is faithful to the automaton).