Access specifiers in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to make the member variable accessible only within the class.

C++

class MyClass {
private:
    int [1];
};

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

Adata

Bvalue

Cnumber

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using reserved keywords as variable names

Leaving the variable name blank

The member variable name can be any valid identifier. Here, value is used as the variable name.

2fill in blank

medium

Complete the code to declare a public member function that returns the private variable.

C++

class MyClass {
private:
    int value;
public:
    int [1]() {
        return value;
    }
};

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

AreturnValue

BsetValue

Cvalue

DgetValue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a setter name for a getter function

Using the variable name as function name

The function name getValue clearly indicates it returns the value of the private variable.

3fill in blank

hard

Fix the error in the code by choosing the correct access specifier to allow derived classes to access the base class member.

C++

class Base {
[1]:
    int protectedVar;
};

class Derived : public Base {
public:
    void show() {
        std::cout << protectedVar << std::endl;
    }
};

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

Aprotected

Bpublic

Cinternal

Dprivate

Attempts:

3 left

💡 Hint

Common Mistakes

Using private instead of protected

Using internal which is not a C++ specifier

The protected access specifier allows derived classes to access the member variable.

4fill in blank

hard

Fill both blanks to declare a class with a private variable and a public setter function.

C++

class Sample {
[1]:
    int data;
[2]:
    void setData(int d) {
        data = d;
    }
};

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

Aprivate

Bprotected

Cpublic

Dinternal

Attempts:

3 left

💡 Hint

Common Mistakes

Making variables public

Using protected for the setter function

The variable data should be private to restrict direct access, and the setter function should be public to allow controlled modification.

5fill in blank

hard

Fill all three blanks to create a class with a private variable, a public getter, and a protected setter.

C++

class Data {
[1]:
    int value;
[2]:
    int getValue() {
        return value;
    }
[3]:
    void setValue(int v) {
        value = v;
    }
};

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

Aprivate

Bpublic

Cprotected

Dinternal

Attempts:

3 left

💡 Hint

Common Mistakes

Making setter public

Making variable public

The variable value is private to protect it. The getter is public to allow reading the value. The setter is protected to allow modification only within the class and derived classes.