Can someone help with this C++ code. I am trying to compile and I keep running into these 4 errors. #include  #include  #include  using namespace std; typedef int fsm_state; typedef char fsm_input; bool is_final_state(fsm_state state) { return (state == 3) ? true : false; } fsm_state get_start_state(void) { return 0; } fsm_state move(fsm_state state, fsm_input input) { // our alphabet includes only 'a' and 'b' if (input != 'a' && input != 'b') assert(0); switch (state) { case 0: if (input == 'a') { return 1; } else if (input == 'b') { return 0; } break; case 1: if (input == 'a') { return 1; } else if (input == 'b') { return 2; } break; case 2: if (input == 'a') { return 1; } else if (input == 'b') { return 3; } break; case 3: if (input == 'a') { return 1; } else if (input == 'b') { return 0; } break; default: assert(0); } } bool recognize(string str) { if (str == "") return false; fsm_state state = get_start_state(); string::const_iterator i = str.begin(); fsm_input input = *i; while (i != str.end()) { state = move(state, *i); ++i; } if (is_final_state(state)) return true; else return false; } // simple driver for testing int main(int argc, char** argv) { recognize(argv[1]) ? cout < 1 : cout < 0; return 0; }