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//Code001
template <class T>
class className
{
    //... .. ...
public:
    T var;
    T someOperation(T arg);
    //... .. ...
};
 
//===============================================================================================//
//Code002
className<int> classObject;
className<float> classObject;
className<string> classObject;
 
 
//===============================================================================================//
//Code003
#include <iostream>
#include <vector>
#include <cstdlib>
#include <string>
#include <stdexcept>
 
using namespace std;
 
template <class T>
class Stack {
private:
    vector<T> elems;    // cac phan tu 
 
public:
    void push(T const&);  // push phan tu vao stack
    void pop();               // phan tu pop
    T top() const;            // tra ve phan tu tren cung
 
    bool empty() const {      // tra ve true neu trong
        return elems.empty();
    }
};
 
template <class T>
void Stack<T>::push(T const& elem) {
    // append copy of passed element 
    elems.push_back(elem);
}
 
template <class T>
void Stack<T>::pop() {
    if (elems.empty()) {
        throw out_of_range("Stack<>::pop(): empty stack");
    }
 
    // xoa phan tu cuoi cung
    elems.pop_back();
}
 
template <class T>
T Stack<T>::top() const {
    if (elems.empty()) {
        throw out_of_range("Stack<>::top(): empty stack");
    }
 
    // tra ve ban copy cua phan tu cuoi cung
    return elems.back();
}
 
int main() {
    try {
        Stack<int> intStack;
        Stack<string> stringStack;
 
        // push int vao stack 
        intStack.push(7);
        cout << intStack.top() << endl;
 
        // push string vao stack 
        stringStack.push("hello");
        cout << stringStack.top() << std::endl;
        stringStack.pop();
        stringStack.pop();
    }
    catch (exception const& ex) {
        cerr << "Exception: " << ex.what() << endl;
        return -1;
    }
}

prog.cpp:15:18: error: conflicting declaration ‘className<float> classObject’
 className<float> classObject;
                  ^~~~~~~~~~~
prog.cpp:14:16: note: previous declaration as ‘className<int> classObject’
 className<int> classObject;
                ^~~~~~~~~~~
prog.cpp:16:11: error: ‘string’ was not declared in this scope
 className<string> classObject;
           ^~~~~~
prog.cpp:16:11: note: suggested alternative: ‘stdin’
 className<string> classObject;
           ^~~~~~
           stdin
prog.cpp:16:17: error: template argument 1 is invalid
 className<string> classObject;
                 ^
prog.cpp:16:19: error: conflicting declaration ‘int classObject’
 className<string> classObject;
                   ^~~~~~~~~~~
prog.cpp:14:16: note: previous declaration as ‘className<int> classObject’
 className<int> classObject;
                ^~~~~~~~~~~

Standard output is empty