Queue

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

#define SIZE 100

int queue[SIZE];
int start = 0;
int end = 0;

void enqueue(int value);
int dequeue();

int main()
{
    enqueue(10);
    enqueue(18);
    printf("%d\n", dequeue());
    enqueue(12);
    enqueue(4);
    printf("%d\n", dequeue());
    printf("%d\n", dequeue());
    printf("%d\n", dequeue());

    return 0;
}

void enqueue(int value)
{
    if(end == SIZE)
    {
        printf("Queue Full\n");
        exit(1);
    }
    queue[end++] = value;
}

int dequeue()
{
    if(start == end)
    {
        printf("Queue Empty\n");
        exit(2);
    }
    return queue[start++];
}