#include <stdio.h>
#include <string.h>
#include <ctype.h>

int count_whites(const char string[]);
void string_to_upper(char string[]);
int div_by_3(const int num);
int same_case(const char a, const char b);
int leap_year(const int year);
int is_white(const char c);
int guess_eval(const int guess, const int my_number);
void change_whites(char string[]);
int is_in_array(const int num, const int size, const int array[]);
int is_prime(const int num);
int karel_fok(const int num);

int main() {

    //printf("%d\n", count_whites("HELLO APA\n"));
    // 3
    //char string[] = "Hello, syopon a anyadpicsajat";
    //string_to_upper(string);
    //printf("%s\n", string);

    //printf("%d\n", div_by_3(4));

    //printf("%d\n", same_case('A','f'));

    //printf("%d\n", is_white('\t'));

    //printf("%d\n", leap_year(3004));
    //printf("%d\n", guess_eval(22,22));
    /*char str[] = "Hello anyad picsaja.";
    change_whites(str);
    printf("%s\n", str);*/

    /*int array[3] = {400,300,304};
    printf("%d %d\n", is_in_array(200,3,array), is_in_array(304,3,array));*/

    //printf("%d %d", is_prime(31), is_prime(33));

    printf("%d\n", karel_fok(2430));

    return 0;
}

int is_white(const char c) {
     if (c ==' ' || c =='\n' || c =='\t') {
            return 1;
        }
    return 0;
}

int same_case(const char a, const char b) {
    if (isupper(a) && isupper(b)) {
        return 1;
    }

    if (islower(a) && islower(b)) {
        return 1;
    }

    if (isalpha(a) == 0 || isalpha(b) == 0) {
        return -1;
    }
    return 0;
}

int div_by_3(const int num) {
    if ( num % 3 == 0) {
        return 1;
    } else {
        return 0;
    }
}

void string_to_upper(char string[]) {


    if (string == NULL) {
        return;
    }

    for (int i = 0; i < strlen(string); i++) {
        string[i] = toupper(string[i]);
    }
}




int count_whites(const char string[]) {
    if (string == NULL) {
        return -1;
    }
    int k = 0;

    int hossz = strlen(string);

    for (int i = 0; i < hossz; i++) {
        if (string[i] ==' ' || string[i] =='\n' || string[i] =='\t') {
            k++;
        }
    }
    return k;
}

int leap_year(const int year) {
    if (year % 4 == 0 && year % 100 != 0 && year % 400 != 0) {
        return 1;
    }
    if (year % 4 == 0 && year % 100 == 0 && year % 400 != 0) {
        return 0;
    }
    if (year % 4 == 0 && year % 100 == 0 && year % 400 == 0) {
        return 1;
    }
    return 0;
}

int guess_eval(const int guess, const int my_number) {
    if (guess == my_number) {
        return 1;
    }

    if (guess > my_number) {
        return 0;
    }

    if (guess < my_number) {
        return 2;
    }
    return 0;
}

void change_whites(char string[]) {
    for (int i = 0; i < strlen(string); i++) {
        if (string[i] ==' ' || string[i] =='\n' || string[i] =='\t') {
            string[i] = '.';
        }
    }

}

int is_in_array(const int num, const int size, const int array[]) {
    int found = 0;

    if (array == NULL) {
        return -1;
    }

    for (int i = 0; i < size; i++) {
        if (array[i] == num  ) {
             found = 1;
        }

    }
    return found;
}

int is_prime(const int num) {

    int j = 0;

    for (int i = 1; i < num + 1; i++) {
        if ( num % i == 0) {
            j++;
        }

    }
    //printf("%d", j);

    int k = 0;

    if ( j == 2) {
        k = 1;
    }

    return k;
}

int karel_fok(const int num) {
    int fok = num;
    if (fok % 90 != 0 || fok < 0) {
        return -1;
    }

    while (fok >= 360) {
        fok -= 360;
    }


    return fok;

}