원형큐

#include<stdio.h>

#define MAX 10

int front,rear;
char queue[MAX];

void init_queue()
{
 front = rear = 0;
}
void clear_queue()
{
 front = rear;
}
int put(char* ch)
{
 if( (rear+1)%MAX == front )
  return -1;
 queue[rear] = *ch;
 rear = ++rear % MAX;
 return 0;
}
int get(char* ch)
{
 if( rear == front )
  return -1;
 *ch = queue[front];
 front = ++front % MAX;
 return 0;
}

void main()
{
 char a,b,c;

 init_queue();

 put("1");
 put("2");
 put("4");

 printf("%c%c%c%c\n",queue[0],queue[1],queue[2],queue[3]);
 get(&a);
 get(&b);
 get(&c);
 printf("%c%c%c%\n",a,b,c);
}