c++ - i can't get an output from this -

#include<iostream>  using namespace std;  class stack {   int size=10;   int stack[size]={0}, value=0, top;   top=size;   public:           void push(int v)          {           if(top==0)             cout<<"\nstack full\n";           else             {--top;             stack[top]=v;}             }           void pop()           {             if(top==size)                cout<<"\nstack empty\n";              else              {top++;               stack[top];               stack[top-1]=0;                }             }         void display()          {             if(top==size)               cout<<"\nstack empty\n";             else               {                 for(int i=top;i<size-1;i++)                 {                  cout<<stack[i];                    }                }               } };  int main()  {   stack s;   char t;   int value,ch;     {   cout<<"\n1.push\n";   cout<<"\n2.pop\n";   cout<<"\n3.display\n";   cout<<"enter choice:\n";   cin>>ch;   switch(ch)   {    case 1:cout<<"\nenter value pushed\n";           cin>>value;           s.push(value);           break;    case 2:s.pop();            break;    case 3:s.display();            break;    default:           cout<<"\nwrong choice\n";   }   cout<<"\ndo u want retry\n";   cin>>t;   }while(t=='y' || t=='y');  return 0;  } 

simplest fix errors occurring changing int size=10; static const int size=10;. after this, apart occurring warning stack[top]; being empty statement, there logical error in display loop in for(int i=top;i<size-1;i++) should either for(int i=top;i<size;i++) or for(int i=top;i<=size-1;i++).