C++ program to implement a Stack class with structure variables as its attributes:

Stackclass.cpp

    #include<iostream>
    #define maxi 1000

    using namespace std;

    struct strstack{
        int a[maxi];
        int top;
    };

    class sstack{

        strstack s;

        public:
            void initialize();
            void push(int val);
            void pop();
            void peep();
            void display();
    };

    void sstack::initialize(){
        cout<<"Empty Stack is created :D ";
        s.top=-1;
    }

    void sstack::push(int val){
        if(s.top==maxi-1){
            cout<<"\nThe Stack is already full...";
            cout<<"\nThe Stack is already full...";
        }
        s.a[++s.top]=val;
    }

    void sstack::pop(){
        if(s.top==-1){
            cout<<"\nThe Stack is already empty..";
        }
        else{
            cout<<"\nThe Popped element is.."<<s.a[s.top];
            s.top--;
        }
    }

    void sstack::peep(){
        if(s.top==-1){
            cout<<"\nThe Stack is already empty..";
        }
        else{
            cout<<"\nThe Topmost element is.."<<s.a[s.top];
        }
    }

    void sstack::display(){
        if(s.top==-1){
            cout<<"\nThe Stack is Empty..";
        }
        else{
            cout<<"\nThe Contents of the Stack is..";
            int x=s.top;
            while(x!=-1){
                cout<<s.a[x]<<" ";
                x--;
            }
        }
    }

    int main()
    {
        sstack s;
        int ch,x,val;
        s.initialize();
        cout<<"\nChoice : \n1) Push \n2) Pop \n3) Peep \n4) Display \n5) Exit :P";
        while(1){
            cout<<"\nEnter your choice..";
            cin>>ch;
            if(ch==1){
                cout<<"\nEnter the element to be inserted..";
                cin>>val;
                s.push(val);
            }
            else if(ch==2){
               s.pop();
            }
            else if(ch==3){
                s.peep();
            }
            else if(ch==4){
                s.display();
            }
            else break;
        }
        return 0;
    }