Push & Pop in a Queue implemented as an array

//Push & Pop in a Queue implemented as an array

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main()
{clrscr();
int rear=-1, front=-1, Size=5;
void InsertQ(int Queue[])
{
    int Insert;
    cout<<"Enter the number you want to insert"<<endl;
    cin>>Insert;
    if(rear==Size-1)
    {
        cout<<"Overflow"<<endl;
    }
    else if(rear==-1)
    {
        rear=front=0;
        Queue[0]=Insert;
    }
        else
        {
            rear++;
            Queue[rear]=Insert;
        }
}

void DeleteQ(int Queue[])
{
    if(front==-1)
    {
        cout<<"Underflow"<<endl;
    }
    else
        if(front==rear)
        {
            cout<<Queue[front]<<" Was Deleted"<<endl;
            front=rear=-1;
        }
        else
        {
            cout<<Queue[front]<<" Was Deleted"<<endl;
            front++;
        }
}
void Display(int Queue[])
{
    int i;
    cout<<"The Queue is: ";
    for(i=front;i<=rear;i++)
    {
        cout<<Queue[i]<<" ";
    }
}
int main()
{
    int Q[50],o1;
    char o2;
    do
    {
        cout<<"MENU"<<endl;
        cout<<"1. Insert \n2. Delete \n3. Display \n4. Exit"<<endl;
        cin>>o1;
        switch(o1)
        {
            case 1:
                InsertQ(Q);
                break;
            case 2:
                DeleteQ(Q);
                break;
            case 3:
                Display(Q);
                break;
            case 4:
                exit(0);
            default:
                cout<<"Please Enter A Valid Option"<<endl;
                break;

        }
        cout<<"Would You Like to Continue?(Y/N)"<<endl;
        cin>>o2;
    }while(o2=='Y' || o2=='y');
}

/*
 MENU
 1. Insert
 2. Delete
 3. Display
 4. Exit
 1
 Enter the number you want to insert
 2
 Would You Like to Continue?(Y/N)
 Y
 MENU
 1. Insert
 2. Delete
 3. Display
 4. Exit
 1
 Enter the number you want to insert
 3
 Would You Like to Continue?(Y/N)
 Y
 MENU
 1. Insert
 2. Delete
 3. Display
 4. Exit
 3
 The Queue is: 2 3
Would You Like to Continue?(Y/N)
 Y
 MENU
 1. Insert
 2. Delete
 3. Display
 4. Exit
 2
 3 Was Deleted
 Would You Like to Continue?(Y/N)
 N
 */