Question

I'm getting an error that states "undefined reference"
I'm new to c++, so I don't know for sure but I think the problem is in the following snippet of code
can you tell me how to fix it?

#include <iostream>
struct Stack;
void initialize(Stack);
bool push(Stack,int);
bool isEmpty(Stack);
int pop(Stack);
using namespace std;
struct Stack
{
int data[100];
int top;
};
int main()
{
Stack s;
int number=0;
initialize(s);
cin>>number;
push(s,number);
number=pop(s);}
//other methods

Answer 1

We need whole program code to answer to your question. Most probably some libraries you are linking are undefined.