Encapsulation best practices in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a private member variable in a class.

C++

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

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

Apublic

Bage

CgetAge

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using access specifiers like 'public' as variable names.

The private member variable should be named age to store the person's age.

2fill in blank

medium

Complete the code to define a public getter method for the private variable.

C++

class Person {
private:
    int age;
public:
    int [1]() {
        return age;
    }
};

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

AgetAge

BsetAge

Cage

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the getter method the same as the variable.

The getter method should be named getAge to return the private variable age.

3fill in blank

hard

Fix the error in the setter method to properly set the private variable.

C++

class Person {
private:
    int age;
public:
    void setAge(int [1]) {
        age = [1];
    }
};

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

Avalue

Bage

Cthis

DnewAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for parameter and member variable without 'this' pointer.

The parameter should have a different name like newAge to avoid confusion and correctly assign the value.

4fill in blank

hard

Fill both blanks to complete the setter method using the 'this' pointer.

C++

class Person {
private:
    int age;
public:
    void setAge(int [1]) {
        this->[2] = [1];
    }
};

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

AnewAge

Bage

Cvalue

DageValue

Attempts:

3 left

💡 Hint

Common Mistakes

Not using 'this->' causing assignment to itself.

The parameter is named newAge and the member variable age is set using this->age.

5fill in blank

hard

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

C++

class Car {
private:
    int [1];
public:
    int get[2]() {
        return [1];
    }
    void set[2](int value) {
        this->[1] = value;
    }
};

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

Aspeed

BSpeed

Cvelocity

DVelocity

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent names between member and methods.

The private member is speed, the getter and setter use Speed with capital S for method names.