c++ - Array bug crashing the console -

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i have no idea wrong here. problem array accessing last element contains terminating code. when use i <= sizeof(arr) limiter in for loop, 4 element list works, 3 element list crashes. if replace i < sizeof(arr), 3 element list works last element in 4 element list ignored.

int arraylist(string arr[]) {     int choice;      (unsigned int = 1; <= sizeof(arr); i++)     {         cout << << ". " << arr[i-1] << endl;     }      cout << "select number 1 " << sizeof(arr)-1 << ": ";     cin >> choice;      return choice; }

here function calls array list, crashes when fourth element accessed.

void titlescreen() {     system("cls");      int choice = 0;      {         string arr[] = { "new game", "continue", "exit" };          choice = arraylist(arr);          switch (choice)         {         case 1:             newgame();             break;         case 2:             continuegame();             break;         case 3:             exitgame();             break;         default:             choice = 0;             cout << "invalid choice." << endl;         }     } while (choice == 0); }

here segment calls list, works correctly.

do {           string arr[] = { "attack", "guard", "skill", "item" };          switch (arraylist(arr))         {         case 1:             hero_act = hero->attack(foe);             break;         case 2:             hero_act = hero->guard();             break;         case 3:             hero_act = hero->skill(foe);             break;         case 4:             hero_act = hero->item();             break;         default:             cout << "action invalid." << endl;             break;         }     } while (hero->hp > 0 && foe->hp > 0); 

string arr[]; sizeof(arr);

is not want, since it's seen compiler as

string *arr; sizeof(arr);

this compile-time constant , return same value (the value depends on machine , compiler used) irrespective of how many elements in array.

passing in count parameter function (old c-style) option. however, if pass automatic arrays size known @ compile time, this

template <size_t n> int arraylist(string (&arr)[n]) { }

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