Free Test Constructors and destr... – C++ Lan...

Q1: What is the purpose of a constructor in a class?

A. To initialize objects B. To destroy objects C. To allocate memory D. To call functions

Q2: Which of the following is a correct constructor declaration?

A. void Constructor() {} B. Constructor() {} C. int Constructor() {} D. Constructor(void) {}

Q3: When is a destructor called?

A. When an object is created B. When an object goes out of scope or is deleted C. When a function is called D. When a constructor fails

Q4: How many destructors can a class have?

A. Multiple B. Only one C. Zero D. Depends on the constructor

Q5: Which keyword is used to declare a destructor?

A. ~ (tilde) B. * (asterisk) C. ! (exclamation) D. @ (at)

Q6: Can constructors be overloaded?

A. Yes B. No C. Only destructors can D. Only virtual functions can

Q7: What happens if no constructor is defined in a class?

A. Compiler provides a default constructor B. No constructor is available C. Compilation error D. Runtime error

Q8: Which of the following is a copy constructor signature?

A. ClassName(ClassName &obj) B. ClassName() C. void ClassName(ClassName obj) D. ClassName* ClassName()

Q9: Can destructors take parameters?

A. Yes B. No C. Only one parameter D. Only default parameters

Q10: Which of the following calls the constructor?

A. Object creation B. Object deletion C. Function call D. Operator overloading

Q11: Is it necessary to explicitly define a destructor?

A. No, unless you need to release resources B. Yes, always C. Only for virtual classes D. Only if using inheritance

Q12: Which of the following statements is true about destructors?

A. Destructors can be virtual B. Destructors can be overloaded C. Destructors must return void D. Destructors can be static

Q13: What is the order of execution when creating and destroying an object?

A. Constructor then destructor B. Destructor then constructor C. Only constructor is called D. Only destructor is called

Q14: Can constructors be inherited?

A. No B. Yes, automatically C. Only copy constructors D. Only default constructors

Q15: What is the effect of declaring a constructor as explicit?

A. Prevents implicit conversions B. Allows automatic type casting C. Makes constructor private D. Makes constructor static

Q16: Can constructors call other constructors in the same class?

A. Yes, using constructor delegation B. No, never C. Only destructors can D. Only static functions can

Q17: Which of the following is NOT a characteristic of constructors?

A. Have no return type B. Can be overloaded C. Called explicitly like normal functions D. Called automatically on object creation

Q18: What happens if a destructor throws an exception?

A. Program calls terminate() B. Exception is caught normally C. Program ignores exception D. Destructor call succeeds

Q19: How do you declare a constructor for a class named "Car"?

A. Car(); B. void Car(); C. ~Car(); D. Car(void*);

Quiz for Constructors and destructors