Queue Program Using Array in C

Queue in C

This Program is for queue implementation using arrays in C. 

#include <stdio.h>
#define N 6
int queue[N] = {0};
int rear = 0,front = 0;

void insert(void);
void delete(void);
void display(void);
void create(void);

void main() 
{
  int user =0;
	
	while(user!=4)
	{
		printf("Size of queue is:%d",N);
		printf("\n 1.Insert");
		printf("\n 2.delete");
		printf("n 3.Display");
		printf("\n 4.Exit");
		printf("\n 5.Create");
		scanf("%d",&user);
		switch(user)
		{
			case 1:
				insert();
				break;
			case 2:
				delete();
				break;
			case 3:
				display();
				break;
			case 4:
				printf("Thank you\n");
				break;
			case 5:
				create();
				break;
		}
	}	
}

void insert(void)
{
	int t;
	if (rear<N)
	{
		printf("Enter a value in queue\n");
		scanf("%d",&t);
		queue[rear] = t;
		rear++;
	}
	else
		{
			printf("queue overflow\n");
		}
}

void delete()
{
	int i;
	printf("deleted element: %d\n",queue[front]);
	queue[front]=0;
	front++;
}

void display(void)
{
	int i;
	for (i=front;i<rear;i++)
	{
			printf("display elements:%d",queue[i]);
	}
	
}

void create()
{
	int t;
	printf("Enter a value to enter into queue\n");
	scanf("%d\n",&t);
	front = 0;
	queue[front] = t;
	rear = front+1;
}