#include <stdio.h>

int parking_queue[10];
int rear = 0; 

void parking_enqueue(int* rear, int car_number) {
    parking_queue[(*rear)++] = car_number;
}

int main() {

    parking_enqueue(&rear, 1234);

    printf("%d\n", parking_queue[0]);
    printf("%d", rear);

}