Creating a generic stack

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C++

Is it possible to have a generic stack which works for all the primitive and non primitive data types?

This is a very serious question because this is confusing me a lot; look at the code of push method of the integer stack

void Stack::push(int number)
{
    Node* newNode=new Node;
    if(head==NULL)
    {
        head=newNode;
        topelement=newNode;
        current=newNode;
        head->object=number;
        head->preptr=NULL;
    }
    else
    {
        topelement=newNode;
        newNode->preptr=current;
        current=topelement;
        newNode->object=number;
    }
}

Now my question is if we make it generic using templates then it can work very well for integers, floats, long, double etc, but what about strings?
For example I have an array in my main program in which I get the string from the user and after that I pass this array to the push method of the stack, now look at the code of push method written for strings only.

void stack::push(char* ptr)
{
    if(ptr==NULL)
    {
        cout<<"\n Can't be pushed";
        return;
    }
    Node* newNode=new Node;
    if(top==NULL)
    {
        head=newNode;
        current=top=newNode;
        head->preptr=NULL;
        //allocating space for the passed string
        int len;
        len=strlen(ptr);
        head->data=new char[len+1];
        strcpy(head->data,ptr);
        head->data[len]='\0';
    }
    else
    {
        top=newNode;
        newNode->preptr=current;
        current=newNode;
        int len;
        len=strlen(ptr);
        newNode->data=new char[len+1];
        strcpy(newNode->data,ptr);
        newNode->data[len]='\0';
    }
}

I am required to make this method generic so that it works for all the primitive data types, strings and the user defined objects. How would I do that?