Practical- 5 || DS || Queues using Array.c

//** open in Vs Code with better comments extension for better view
/*
 * Queue using Array program Practical-5
*/
// todo standard lib / definitions
#include<stdio.h>
#define N 5
int queue[N];
int front =-1;
int rear=-1;

// todo The prototypes of functions
void enqueue();
void dequeue();
void peek();
void display();

// todo enqueue Function
void enqueue(){
    //! we are adding elements in queue,
    //! so we need to check is the array full first
    if(rear==N-1){
        printf("\n Queue Overflow");
    }
    /*
      ! now we have 2 conditions for filling,
      ! one for filling first time and one for rest of the time.
      ! because for first time, we even need to even move the front counter
    */

    else if(rear==-1 && front==-1 ){
        front++;
        rear++;
        printf("\nEnter the value you want to enter:  ");
        scanf("%d",&queue[rear]);
    }
    else{
        rear++;
        printf("\nEnter the value you want to enter:  ");
        scanf("%d", &queue[rear]);
    }
}

// todo dequeue Function
void dequeue(){

    //! we are removing elements in queue,
    //! so we need to check is the array empty first
    if (rear == - 1 && front == -1)
    {
        printf("\n Queue Underflow");
    }
    /*
      ! now we have 2 conditions for removing,
      ! one for removing when f,r are same and one for rest of the time.
    */

    else if (rear == front)
    {
        printf("\nThe Value you removed is:  %d",queue[front]);
        front = -1;
        rear = -1;

    }
    else
    {

        printf("\nThe Value you removed is:  %d", queue[front]);
        queue[front]=0;
        front++;
    }
}

// todo peek Function
void peek(){
    if(front==-1){
        printf("\nThe queue is empty");
    }
    else{
        printf("\nThe element at the front of queue is: %d",queue[front]);
    }
}

// todo display Function
void display(){
    //? prints all the elements of the array
    for(int i=0;i<N;i++){
        printf("\n%d",queue[i]);
    }
}

// todo main Functions
void main(){
    int option;
    //? loop for the main menu
    do
    {
        printf("\n **-------Main Menu-------**");
        printf("\n 1. Enqueue");
        printf("\n 2. Dequeue");
        printf("\n 3. Peek");
        printf("\n 4. Display");
        printf("\n 5. Exit");
        printf("\n Enter your option: ");
        scanf("%d", &option);
        //? switch case for options
        switch (option)
        {
        case 1: enqueue();
                break;

        case 2: dequeue();
                break;

        case 3: peek();
                break;

        case 4: display();
                break;

        }
    } while (option != 5);

}