1. wrote the class template of the chain stack, saved it as the header. h file, and designed a simple addition, subtraction, multiplication and division calculator based on this. In the process of compilation, the following error occurred. I don"t know how to solve it. Ask for the guidance of God ~

"header. H" file is as follows:

 //
-sharpinclude<cassert>
using namespace std;
template<typename T>class Stack;
template<typename T>class Node{ //
    T info;
    Node<T>*link;
public:
    Node(T date = 0, Node<T>*next = NULL) {
        info=data; //C2563: 
        link=next; //C2568: "=" 
    }
    friend class Stack<T>;
};
template<typename T>class Stack{ //
    Node<T>*top; //
public: 
    Stack() { top = NULL; }
    ~Stack();
    void Push(const T &data); //
    T Pop(); //
    T GetTop();  //
    void MakeEmpty(); //
    bool IsEmpty(){ return top == NULL; }
};
template<typename T>Stack<T>::~Stack() { MakeEmpty(); }
template<typename T>void Stack<T>::MakeEmpty() {
    Node<T>*temp;
    while (top != NULL) { temp = top; top = top->link; delete temp; }

}
template<typename T>void Stack<T>::Push(const T &data) {
    top = new Node<T>(data, top);
}
template<typename T>T Stack<T>::Pop() {
    assert(!IsEmpty());
    Node<T>*temp = top;
    T data = temp->info;
    top = top->link; //
    delete temp; //
    return data; //
} 
template<typename T>T Stack<T>::GetTop() {
    assert(!IsEmpty());
    return top->info;
}

.cpp:

-sharpinclude<iostream>
-sharpinclude<cmath>
-sharpinclude<cstdlib>
-sharpinclude".h" 
using namespace std;
class Calculator { //
    Stack<int>Nstack;
    Stack<char>Ostack;
public:
    Calculator(void) { };
    void Cal(void);
    void GetTwoNum(int &Num1, int &Num2);
    void Compute(char Opr);
    void Clear(void);
};
void Calculator::Clear() {
    Nstack.MakeEmpty();
    Ostack.MakeEmpty();
}
void Calculator::GetTwoNum(int &Num1, int &Num2) {
    Num1 = Nstack.Pop();
    Num2 = Nstack.Pop();
}
void Calculator::Compute(char Opr) {
    int Num1, Num2;
    if (Opr != "=")GetTwoNum(Num1, Num2);
    switch (Opr) {
    case "+":Nstack.Push(Num2 + Num1); break; //
    case "-":Nstack.Push(Num2 - Num1); break;
    case "*":Nstack.Push(Num2 * Num1); break;
    case "/":Nstack.Push(Num2 / Num1); break;
    case "=":cout << Nstack.Pop() << endl;
    }
}
void Calculator::Cal() { //or
    bool b1 = true,b2 = true;
    char ch1, ch2, str[50]; //ch1ch2
    int k = -1;
    while (b2) {
        cin >> ch1;
        if (ch1 >= "0"&&ch1 <= "9") {
            kPP;
            str[k] = ch1;//
        }
        else {
            if (k >= 0) {
                str[k + 1] = "\0";
                Nstack.Push(atoi(str)); //
                k = -1;
            }
            switch (ch1) {
            case"c":
                Clear();
                break;
            case"+":  
            case"-":                             //+ - = 
                while (!Ostack.IsEmpty()) {
                    ch2 = Ostack.Pop();

                    Compute(ch2);
                }
                Ostack.Push(ch1);
                break;
            case"*":
            case"/":
                while (!Ostack.IsEmpty() && b1) {
                    ch2 = Ostack.Pop();    //
                    if (ch2 == "*" || ch2 == "/") //
                        Compute(ch2); // * / * or / 
                    else {
                        Ostack.Push(ch2); // ,
                        b1 = false;
                    }
                }
                Ostack.Push(ch1); //
                b1 = true;
                break;
            case"=":
                while (!Ostack.IsEmpty()) {
                    ch2 = Ostack.Pop();
                    Compute(ch2);
                }
                Compute(ch1);
                break;
            }
                    if (ch1 == "z") b2 = false;
        }
            
    
    }
}
int main(){
    Calculator Calcul;
    cout << ":" << endl;
    Calcul.Cal();
    getchar();
    return 0;
}


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