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OOP

23.Problem statement

    C++ Program to Implement Deque in Stl

     Program

    #include <iostream>

    #include <deque>

    #include <string>

    #include <cstdlib>

    using namespace std;

    int main()

    {

        deque<int> dq;

        deque<int>::iterator it;

        int choice, item;

        while (1)

        {

            cout<<"\n---------------------"<<endl;

            cout<<"Deque Implementation in Stl"<<endl;

            cout<<"\n---------------------"<<endl;

            cout<<"1.Insert Element at the End"<<endl;

            cout<<"2.Insert Element at the Front"<<endl;

            cout<<"3.Delete Element at the End"<<endl;

            cout<<"4.Delete Element at the Front"<<endl;

            cout<<"5.Front Element at Deque"<<endl;

            cout<<"6.Last Element at Deque"<<endl;

            cout<<"7.Size of the Deque"<<endl;

            cout<<"8.Display Deque"<<endl;

            cout<<"9.Exit"<<endl;

            cout<<"Enter your Choice: ";

            cin>>choice;

            switch(choice)

            {

            case 1:

                cout<<"Enter value to be inserted at the end: ";

                cin>>item;

                dq.push_back(item);

                break;

            case 2:

                cout<<"Enter value to be inserted at the front: ";

                cin>>item;

                dq.push_front(item);

                break;

            case 3:

                item = dq.back();

                dq.pop_back();

                cout<<"Element "<<item<<" deleted"<<endl;

                break;

            case 4:

                item = dq.front();

                dq.pop_front();

                cout<<"Element "<<item<<" deleted"<<endl;

                break;

            case 5:

                cout<<"Front Element of the Deque: ";

                cout<<dq.front()<<endl;

                break;

            case 6:

                cout<<"Back Element of the Deque: ";

                cout<<dq.back()<<endl;

                break;

            case 7:

                cout<<"Size of the Deque: "<<dq.size()<<endl;

                break;

            case 8:

                cout<<"Elements of Deque:  ";

                for (it = dq.begin(); it != dq.end(); it++)

                    cout<<*it<<"  ";

                cout<<endl;

                break;

            case 9:

                exit(1);

                break;

            default:

                cout<<"Wrong Choice"<<endl;

            }

        }

        return 0;

    }

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