Object creation and destruction flow in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constructor for class MyClass.

C++

class MyClass {
public:
    MyClass() [1] {
        // constructor body
    }
};

Drag options to blanks, or click blank then click option'

A[]

B{}

C()

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses () instead of curly braces {} for the constructor body.

Using square brackets [] or angle brackets <> which are invalid here.

The constructor body is enclosed in curly braces {} in C++.

2fill in blank

medium

Complete the code to define a destructor for class MyClass.

C++

class MyClass {
public:
    ~MyClass() [1] {
        // destructor body
    }
};

Drag options to blanks, or click blank then click option'

A{}

B()

C[]

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses () instead of curly braces {} for the destructor body.

Using invalid brackets like [] or <>.

Destructor bodies are defined with curly braces {} in C++.

3fill in blank

hard

Fix the error in the constructor definition syntax.

C++

class MyClass {
public:
    MyClass [1] {
        // constructor body
    }
};

Drag options to blanks, or click blank then click option'

A<>

B{}

C[]

D()

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses () after constructor name.

Using curly braces {} instead of parentheses ().

Constructor declarations require parentheses () after the name, even if no parameters.

4fill in blank

hard

Fill both blanks to create an object and call its destructor explicitly.

C++

MyClass obj[1];
obj[2];

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A()

B~MyClass()

C~MyClass

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete keyword on stack objects.

Calling destructor without parentheses.

Omitting parentheses when creating object.

Objects are created with parentheses (). The destructor can be called explicitly as ~MyClass().

5fill in blank

hard

Fill all three blanks to define a class with constructor, destructor, and create an object.

C++

class MyClass {
public:
    MyClass[1] [2];
    ~MyClass() [3];
};

MyClass obj();

Drag options to blanks, or click blank then click option'

A()

B{}

C;

D() {}

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon instead of curly braces for function bodies.

Omitting parentheses in constructor declaration.

Confusing declaration and definition syntax.

Constructor declaration uses (), definition uses {}. Destructor also uses {} for body.