Data members and member functions in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a data member named 'age' of type int inside the class.

C++

class Person {
public:
    [1] age;
};

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

Avoid

Bint

Cfloat

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' as a data member type causes a syntax error.

Using 'string' without including the proper header or namespace.

The data member 'age' should be declared as type int to store whole numbers.

2fill in blank

medium

Complete the code to define a member function named 'getAge' that returns the age.

C++

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

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AsetAge

Bage

CgetAge

DprintAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'setAge' which is usually for setting a value, not getting.

Using the data member name 'age' as a function name causes confusion.

The member function that returns the age should be named getAge.

3fill in blank

hard

Fix the error in the member function definition to correctly set the age.

C++

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

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

Athis->age

Ba

Cage

DsetAge

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning parameter to itself like a = a; which does nothing.

Using just 'age = a;' without this-> can cause ambiguity.

Use this->age to refer to the data member and avoid confusion with the parameter a.

4fill in blank

hard

Fill both blanks to create a member function that increases age by 1 and returns the new age.

C++

class Person {
private:
    int age;
public:
    int [1]() {
        age [2] 1;
        return age;
    }
};

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

AincrementAge

B+=

C-=

DdecrementAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-=' operator which decreases the value.

Naming the function 'decrementAge' which means to reduce age.

The function name should be incrementAge and the operator += adds 1 to age.

5fill in blank

hard

Fill all three blanks to define a constructor that sets the age data member using the parameter.

C++

class Person {
private:
    int age;
public:
    Person(int [1]) {
        [2] = [3];
    }
};

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

Aa

Bthis->age

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for parameter and data member without this-> causes ambiguity.

Assigning parameter to itself like a = a; which does nothing.

The constructor parameter is named a. Use this->age = a; to set the data member.