Constructor overloading in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constructor that takes no arguments.

C++

class Box {
public:
    Box() [1] {}
};

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

Areturn

Bvoid

C: width(0), height(0), depth(0)

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to put a return type for the constructor.

Using 'void' keyword in constructor declaration.

The constructor initializes width, height, and depth to 0 using an initializer list.

2fill in blank

medium

Complete the code to declare a constructor that takes three integer parameters.

C++

class Box {
public:
    Box(int w, int h, int d) [1] {}
};

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

Areturn w, h, d;

Bwidth = w; height = h; depth = d;

Cvoid

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to use 'return' inside constructor.

Adding a return type like 'void' or 'int' to constructor.

The constructor assigns the parameters to the class members inside the constructor body.

3fill in blank

hard

Fix the error in the constructor declaration to properly overload it.

C++

class Box {
public:
    Box() {}
    Box(int w, int h, int d) [1] {}
};

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ABox()

BBox(int w, int h)

Cvoid Box(int w, int h, int d)

DBox(int w, int h, int d)

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type like 'void' to constructor.

Changing the constructor name to something else.

The constructor must have the same name as the class and no return type to overload properly.

4fill in blank

hard

Fill both blanks to complete the constructor initializer list and body.

C++

class Box {
    int width, height, depth;
public:
    Box(int w, int h, int d) [1] [2] {}
};

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

A: width(w), height(h), depth(d)

Bwidth = w; height = h; depth = d;

C{}

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Putting assignments inside the initializer list.

Forgetting the colon before initializer list.

The initializer list sets the members before the constructor body, which is empty here.

5fill in blank

hard

Fill all three blanks to complete the overloaded constructors with default values.

C++

class Box {
    int width, height, depth;
public:
    Box() [1] {}
    Box(int w) [2] {}
    Box(int w, int h, int d) [3] {}
};

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

A: width(0), height(0), depth(0)

B: width(w), height(0), depth(0)

C: width(w), height(h), depth(d)

Dwidth = 0; height = 0; depth = 0;

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to assign values inside the constructor body instead of initializer list.

Forgetting to initialize all members.

Each constructor uses an initializer list to set member variables with appropriate default or given values.