#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

typedef struct {
    int* elements;
    int head;
    int tail;
    int size;
} queue;

queue* qcreate();
void qput(queue *q, int element);
int qget(queue *q);
int qempty(queue *q);
int qfull(queue *q);
void qclear(queue* q);

queue* qcreate(int size) {
    queue* q = malloc(sizeof(queue));
    q->elements = malloc(sizeof(int) * size);
    q->size = size;
    qclear(q);
    return q;
}

void qput(queue* q, int element) {
    assert(q->tail != -1);
    q->elements[q->tail] = element;
    q->tail = (q->tail + 1) % q->size;
    if(q->head == q->tail) q->tail = -1;
}

int qget(queue* q) {
    assert(q->tail != q->head);
    if(q->tail == -1) q->tail = q->head;
    int element = q->elements[q->head];
    q->head = (q->head + 1) % q->size;
    return element;
}

int qempty(queue* q) {
    return (q->head == q->tail);
}

int qfull(queue* q) {
    return (q->tail == -1);
}

void qclear(queue *q) {
    q->head = 0;
    q->tail = 0;
}

void qdestroy(queue *q) {
    free(q->elements);
    free(q);
}

int main( int argc, char *argv[] ) {
	queue* q = qcreate(300);
    int i = 0;
    while(!qfull(q)) qput(q,i++);

    while(!qempty(q)) printf("%d\n",qget(q));
	return 0;
}