push pop code in c 2b 2b

1#include<iostream>
2using namespace std;
3#define Max 100
4class stack{
5	public:
6		int top;
7		int size;
8		int *s;
9		int stack[Max];
10		
11		void push()
12		{
13			int value;
14			if(top==size-1)
15			{
16				cout<<"overflow";
17			}
18			else
19			{
20				cout<<"Enter value to push \n";
21				cin>>value;
22				top++;
23				stack[top]=value;
24			}
25		}
26		int pop()
27		{
28			if(top==-1)
29			{
30				cout<<"Underflow";
31			}
32			else
33			{
34				cout<<"Deleted value is \n"<<stack[top];
35				top--;
36			}
37		}
38		void display()
39		{
40			int i;
41			for(i=top;i>=0;i--)
42			{
43				cout<<stack[i]<<endl;
44			}
45		}
46};
47int main()
48{
49	stack st;
50	cout<<"Enter the size of the stack";
51	cin>>st.size;
52	st.s=new int[st.size];
53	st.top=-1;
54	int ch;
55	while(st.size!=0)
56	{	
57	cout<<endl<<"    #####       STACK MENU     #####     "<<endl;
58	cout<<"1. PUSH OPERATION \n2. POP OPERATION \n3. DISPLAY \n4.Exit \n";
59	cin>>ch;
60	switch(ch)
61	{
62		case 1: 
63		    st.push();
64		    break;
65		case 2:
66			st.pop();
67			break;
68		case 3:
69			st.display();
70			break;
71		case 4:
72			exit(0);
73			
74		default:cout<<"\n Choose correct option";
75	}
76}
77return 0;
78}