Answer Posted / jhil

# include<iostream.h>
# include<conio.h>
# define SIZE 20

class stack
{
int a[SIZE];
int top; // Top of Stack
public:
stack();
void push(int);
int pop();
int isempty();
int isfull();
};
stack::stack()
{
top=0; //Initialize Top of Stack
}

int stack::isempty()
{
return (top==0?1:0);
}
int stack::isfull()
{
return (top==SIZE?1:0);
}

void stack::push(int i)
{

if(!isfull())
{
cout<<"Pushing a data "<<i<<endl;
a[top]=i;
top++;
}
else
{
cout<<"Stack overflow error !Possible Data Loss !";
}
}
int stack::pop()
{
if(!isempty())
{
cout<<"Popping "<<a[top-1]<<endl;
return(a[--top]);
}
else
{
cout<<"Stack is empty! What to pop...!";
}
return 0;
}

void main()
{
clrscr();
stack s;

s.push(1);
s.push(2);
s.push(3);

s.pop();
s.pop();

getch();
}

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