euu2RR - 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 resp,data,i;

	while(1){
		printf("1:enqueue 2:dequeue 0:end\n");
		scanf("%d",&resp);

		if(!resp) break;

		switch(resp){
			case 1:
				printf("enqueue:");
				scanf("%d",&data);
				enqueue(data);
				break;
			case 2:
				dequeue();
				break;
		}
		printf("haed=%d tail=%d\n",head,tail);
	}
	printf("\n");
	while(i != tail){
		printf("queue[%d]=%d\n",i,queue[i]);
		i++;
		i=i%SIZE;
	}

	return 0;
}

void enqueue(int value){
	if(head == (tail+1) % SIZE){
		printf("キューが満杯で入りません\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\n");
		return 0;
	}else{
		value = queue[head++];
		head = head % SIZE;
		return value;
	}
}