8DdUOr - Online C Compiler & Debugging Tool

#include<stdio.h>

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

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

void print_q(){
	for(int i=0; i<SIZE; i++){
      printf("queue[%d]=%d head=%d tail=%d ,", i, queue[i],head,tail );
    }
    printf("\n------------\n");
}
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("queueは満杯です");
   }
   else{
   	queue[tail++] = value;
   	tail = tail%SIZE;
   }
   print_q();
}

int dequeue(void)
{
	int value;
	if(head==tail){
		printf("queueは空です");
		return 0;
	}
	else{
		value = queue[head];
		queue[head] = 0;
		head++;
		head = head%SIZE;

	}
	print_q();
	return value;

}