Quiz for Class templates

Q1: What is a class template in C++?

A. A blueprint for creating classes to work with any data type B. A class that cannot be instantiated C. A class with fixed data types only D. A macro

Q2: How do you declare a class template?

A. template <typename T> class MyClass {}; B. class template MyClass<T> {}; C. template class MyClass<T> {}; D. class MyClass template <T> {};

Q3: Can class templates have multiple template parameters?

A. Yes, like template<typename T, typename U> B. No, only one parameter allowed C. Yes, but only for function templates D. No, causes errors

Q4: How do you create an object of a class template?

A. MyClass<int> obj; B. MyClass obj<int>; C. obj = MyClass<int>(); D. MyClass obj = int();

Q5: What is the difference between a class template and a function template?

A. Class templates define generic classes; function templates define generic functions B. There is no difference C. Function templates are faster D. Class templates cannot be overloaded

Q6: Can class templates have member functions?

A. Yes, member functions can be defined inside or outside the class template B. No, only data members allowed C. Yes, but only inline functions D. No, member functions cause errors

Q7: How do you define member functions of a class template outside the class?

A. template<typename T> void MyClass<T>::func() {} B. void MyClass<T>::func() {} C. template void MyClass::func() {} D. void MyClass::func<T>() {}

Q8: Can class templates be specialized?

A. Yes, to provide specific implementations for particular types B. No, specialization is only for function templates C. Yes, but only partial specialization D. No, causes errors

Q9: What is partial specialization in class templates?

A. Defining a template with some template parameters fixed B. Specializing all template parameters C. Ignoring template parameters D. Using default arguments only

Q10: Can class templates inherit from other class templates?

A. Yes, class templates can inherit from other templates B. No, inheritance is disallowed for templates C. Only function templates can inherit D. Only concrete classes can inherit

Q11: Which of the following is a valid instantiation of a class template?

A. MyClass<double> obj; B. MyClass obj<double>; C. MyClass obj = double(); D. obj = MyClass<double>();

Q12: Can class templates have static members?

A. Yes, static members can be defined and shared among all instantiations B. No, static members are not allowed in templates C. Static members must be non-template D. Only static functions allowed

Q13: What happens if you use a class template without specifying a template argument?

A. Compilation error B. Default template type is used C. Template parameter is inferred D. Runs with void type

Q14: Can class templates be friends of other classes?

A. Yes, friendship can be granted to template classes B. No, templates cannot be friends C. Only function templates can be friends D. No, causes errors

Q15: Which syntax correctly defines a class template with two parameters?

A. template<typename T, typename U> class MyClass {}; B. class MyClass<T, U> template {}; C. template MyClass<typename T, typename U> {}; D. class template MyClass<T, U> {};

Q16: Can template parameters be used as data members types?

A. Yes, template parameters define types used for data members B. No, data members must have fixed types C. Only integral types allowed D. Only pointers allowed

Q17: How do you define a constructor in a class template?

A. Inside the template class as usual with the template parameters B. Constructors are not allowed in templates C. Constructors must be static D. Use special syntax outside the class only

Q18: Can a class template have default template arguments?

A. Yes, like template<typename T = int> B. No, default arguments are not allowed C. Yes, but only for function templates D. No, causes compile errors

Q19: What is the main advantage of class templates?

A. Code reusability with multiple data types B. Faster execution speed C. Reduced memory usage D. Simpler syntax than macros