Bulls n Cows

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>

#define TEST true     // If true run tests (only), else run program
#define DEBUG true    // If true, print number to guess to make debugging easier

// ----------- Declare functions used in main ----------

// Generates a 4-digit random number with no repeated digits
// (digits in range 1-9)
int get_random_4digit();

// Returns number of bulls in guessed number
int count_bulls(int guess, int answer);

// Returns number of bulls and cows in guessed number
int count_cows_and_bulls(int guess, int answer);

// Get input from player
int get_player_guess();

// Testing of functions, see far below
void test();

int n_digits(int number);

bool digit_is_in(int number, int digit);

int rand_nr1;
int rand_nr2;
int rand_nr3;
int rand_nr4;
int answer = 0;
int total= 0;

/*
 *  Program starts here
 */
int main(void) {

    srand((int) time(NULL));     // Init random number generator
    answer = get_random_4digit;
    printf("Answer is %d\n", total);
    /*if (TEST) {
        test();
        return 0;
    }

    int answer = get_random_4digit();
    if (DEBUG) {
        printf("Answer is %d\n", answer);
    }

    printf("Welcome to Bulls and Cows\n");
    printf("Try to guess a 4 digit number with digits 1-9\n");
    printf("and no repeating digits (-1 to abort).\n\n");
    printf("Bulls = correct digit(s) in correct positions.\n");
    printf("Cows = correct digit(s).\n\n");

    bool aborted = false;
    int n_guess = 0;
    int guess = 0;
    int bulls = 0;
    int cows = 0;

    // ----- The game loop ------

    // TODO Use functions (and more) to implement the game
    // TODO Try to sketch one round, then surround with a loop.

    // --- End game loop --------

    if (aborted) {
        printf("Game aborted\n");
    } else {
        printf("Done, number was %d and you needed %d guesses\n", answer, n_guess);
    }
*/
    return 0;
}

// ------- Functions definitions --------------------------------

// TODO All the function definitions here

//rand_nr = sträng? köra index(i) på string.at?, använda string.find(number)

// This one's for free...
int get_player_guess() {
    int guess;
    printf("Guess > ");
    scanf("%d", &guess);
    return guess;
}

int n_digits(int number){
    int count = 0;
    if (number > 0)
    {
        number = number %10;
        count ++;
    }
    return count;
}

bool digit_is_in(int number, int digit){


}

int get_random_4digit(){
    rand_nr1 = rand() % 9 + 1;
    rand_nr2 = rand() % 9 + 1;
    rand_nr3 = rand() % 9 + 1;
    rand_nr4 = rand() % 9 + 1;
    return total = rand_nr1*1000 + rand_nr2*100 + rand_nr3*10 + rand_nr4*1;

}

// Returns number of bulls in guessed number
int count_bulls(int guess, int answer){

    //if guess at [x] == rand_nr then bull++

}

// Returns number of bulls and cows in guessed number
int count_cows_and_bulls(int guess, int answer){

    //
    // cows = found -- bulls;

}

// ---------------- The function to do all tests --------------------

#define EQUALS(v1, v2) printf((v1) == (v2) ? "true\n" : "false\n")

void test() {

    // TODO Uncomment on at the time and test
    /*
    EQUALS(n_digits(123), 3);
    EQUALS(n_digits(12345), 5);
    EQUALS(n_digits(1023945), 7);

    EQUALS(get_digit_at_index(12345, 0), 1);
    EQUALS(get_digit_at_index(12345, 2), 3);
    EQUALS(get_digit_at_index(12345, 4), 5);

    printf("Random answer %d\n", get_random_4digit());
    printf("Random answer %d\n", get_random_4digit());
    printf("Random answer %d\n", get_random_4digit());

    EQUALS(digit_is_in(2637, 2), true);
    EQUALS(!digit_is_in(2637, 4), true);

    EQUALS(count_bulls(1807, 7810), 1);
    EQUALS(count_bulls(2647, 2837), 2);

    EQUALS(count_cows_and_bulls(1807, 7810), 4);
    EQUALS(count_cows_and_bulls(2647, 2837), 2);
    */
}