4SMFEA - Online C Compiler & Debugging Tool

#include<stdio.h>

	#define SIZE 5
	int queue[SIZE];
	int head, tail;

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

	int main(void)
	{
	    head = tail = 0;
	    int data, i;

	    enqueue(1);
	    enqueue(2);
	    dequeue();
	    enqueue(3);
	    dequeue();
	    enqueue(4);
	    enqueue(5);
	    dequeue();
	    enqueue(6);

	    for(i=0; i<SIZE; i++){
	      printf("queue[%d]=%d\n", i, queue[i] );
	    }

	    return 0;
	}

	void enqueue(int value)
	{
	   if( head == (tail+1)%SIZE ){
	   	printf("キューは満杯で入りませんでした\n");
	   }else{
		queue[tail++] = value;
	   }

	tail = tail % SIZE;

	}

	int dequeue(void)
	{

	int value;
	if( head == tail ){
		printf("キューは空で取り出せませんでした\n");
		return 0;
	}else{
		queue[head] = 0;
		value = queue[head++];

	}
	head = head % SIZE;
	return value;

	}