class stack
{
         int top;
         public:
         int arr[500];
    stack()
    {
        top=-1;
    }

    void push(int);

};

    void stack::push(int item)
{


    arr[top++]=item;                        //problem here
    cout<<"n"<<item<<"pushed in stack";
    cout<<"n top value is"<<top;
}


   int main()
{
    stack s;
    s.push(12);
    s.push(19);
    s.push(31);
    return 0;
}