Coding-Community-Contributions/Queue.cpp at main · Manish1Gupta/Coding-Community-Contributions · GitHub

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#include <bits/stdc++.h>
using namespace std;


int q[100];
int front=-1;
int rear=-1;

void insert(int n)
{
    if(front==-1 && rear==-1)
    {
        front=0;
        rear=0;
        q[rear]=n;
    }
    else if((rear+1)%100==front)
    {
        cout<<"queue overflow";
    }
    else
    {
        rear=(rear+1)%100;
        q[rear]=n;
    }
}

int del()
{
    if((front==-1) && (rear==-1))
    {
        cout<<"\nQueue underflow";
    }
    else if(front==rear)
    {
         cout<<"\nthe element deleted is "<<q[front]<<"\n";
         front=-1;
         rear=-1;
    }
    else
    {
         cout<<"\nthe element deleted is "<<q[front]<<"\n";
         front=(front+1)%100;
    }
}

void display()
{
    int i=front;
    if(front==-1 && rear==-1)
    {
        cout<<"\nqueue is empty";
    }
    else
    {

        while(i<=rear)
        {
            cout<<q[i]<<" ";
            i=(i+1)%100;
        }
    }
    printf("\n");
}
int main()
{
    int ch=1,n;

    while(ch!=0)
    {
    cout<<"\n1: Insert | 2: Delete | 3: Display\n ";
    cin>>ch;

    switch(ch)
    {

        case 1:  cout<<"\nEnter the element which is to be inserted:-";
                 cin>>n;
                 insert(n);
                 break;
        case 2:  del();
                 break;
        case 3:  display();
                 break;
        default: cout<<"\nEnter the correct choice";
                 ch =1;
                 break;

    }
}
    return 0;
}