Почему функция randomize () не работает?

Я и мой друг пытаемся сделать игру «Палач», используя C ++ для нашего школьного проекта. Но при компиляции сообщения показывают, что стандартные функции randomize () и random не были объявлены в этой области. Что не так в коде?

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;
const int MAXLENGTH=80;
const int MAX_TRIES=5;
const int MAXROW=7;

int letterFill (char guess, char secretword[], char guessword[]) {
int matches = 0;
for (int i = 0; secretword[i]!='\0'; i++) {
if (guess == guessword[i])
return 0;
if (guess == secretword[i]) {
guessword[i] = guess;
matches++;
}
}
return matches;
}

void initUnknown (char word[], char unknown[]) {
int i, length = strlen(word);
for (i = 0; i < length; i++)
unknown[i]='*';
unknown[i]='\0';
}

int main () {
char unknown [MAXLENGTH];
char letter;
int wrong_guesses=0;
char word[MAXLENGTH];
char words[][MAXLENGTH] = { "batman begins", "superman returns", "2012",
"tarzan", "goal", "300", "space jam", "transformers", "megamind",
"spiderman" };
randomize();
int n=random(10);
strcpy(word,words[n]);
initUnknown(word, unknown);

cout << "\n\nWelcome to hangman...Guess a Movie Name";
cout << "\n\nEach letter is represented by a star.";
cout << "\n\nYou have to type only one letter in one try";
cout << "\n\nYou have " << MAX_TRIES << " tries to try and guess the word.";
cout << "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~";

while (wrong_guesses < MAX_TRIES) {
cout << "\n\n" << unknown;
cout << "\n\nGuess a letter: ";
cin >> letter;
if (!letterFill(letter, word, unknown)) {
cout << endl << "Whoops! That letter isn't in there!" << endl;
wrong_guesses++;
} else
cout << endl << "You found a letter! Isn't that exciting!" << endl;

cout << "You have " << MAX_TRIES - wrong_guesses;
cout << " guesses left." << endl;
if (!strcmp(word, unknown)) {
cout << word << endl;
cout << "Yeah! You got it!";
break;
}
}
if(wrong_guesses == MAX_TRIES) {
cout << "\nSorry, you lose...you've been hanged." << endl;
cout << "The word was : " << word << endl;
}
cin.get();
}