42 interview questions on C++ - Fundamentals for developers (2025)

Hard

5 votes511 runs0 comment

Which statement concerning constructors is false ?

Back-end developer

constructors

attributes

Samuelat Mar 28, 2022

Hard

5 votes296 runs0 comment

Write a C++ class with a constructor that takes two arguments.

Back-end developer

constructor

inheritance

Samuelat Mar 28, 2022

Medium

3 votes416 runs1 comment

How to distinguish a parameter of a method from an attribute of the class in C++

Back-end developer

c++

method

attribute

Samuelat Mar 28, 2022

Easy

3 votes392 runs0 comment

Which type should you use to represent a data list with a length that can change ?

Back-end developer

array

vector

Samuelat Mar 28, 2022

Medium

2 votes432 runs1 comment

The operator + has been defined for Complexe objects thanks to an intern overloading.

Back-end developer

operators

overloading

Samuelat Mar 5, 2024

Easy

2 votes423 runs0 comment

What is the default visibility of class members in C++?

Back-end developer

classes

visibility

Samuelat Mar 28, 2022

Expert

2 votes411 runs0 comment

Write a C++ program that uses static variables.

Back-end developer

static

constructor

destructor

Samuelat Mar 28, 2022

Hard

2 votes398 runs0 comment

In C++, it is possible to give a default value to a parameter of a function and two functions can have the same name if their signatures are different but not only different on the return type.

Back-end developer

functions

parameters

return type

Samuelat Mar 28, 2022

Easy

2 votes379 runs0 comment

Write a C++ program that displays a memory address.

Back-end developer

memory

pointers

Samuelat Mar 28, 2022

Easy

2 votes379 runs0 comment

Write a C++ program to add two complex numbers.

Back-end developer

operators

classes

Samuelat Mar 28, 2022

Easy

2 votes370 runs0 comment

Print the message 'n = 10' in C++

Back-end developer

cout

iostream

Samuelat Mar 28, 2022

Hard

1 vote425 runs1 comment

What does the following code display ? class A { public: A() { f(); } virtual void f() { cout << "A" << endl; } }; class B : public A { public: void f() { cout << "B" << endl; } }; int main() { A a; B b; A* pa(&b); pa->f(); return 0; }

Back-end developer

inheritance

virtual functions

Samuelat Apr 10, 2024

Easy

1 vote391 runs0 comment

Which statement concerning the line ": rectangle(h, l), couleur(c)" is true ? class Rectangle {...} class Couleur {...} class RectangleColore { RectangleColore(double h, double l, Couleur c) : rectangle(h, l), couleur(c) {...} private: Rectangle rectangle; Couleur couleur; }

Back-end developer

constructors

initializer list

Samuelat Mar 28, 2022

Medium

1 vote386 runs0 comment

Write a function to display objects of type Complex.

Back-end developer

operators

classes

Samuelat Mar 28, 2022

Hard

1 vote128 runs0 comment

How to use the logic operators AND / OR / NOT in C++

Back-end developer

operators

logic

Samuelat Mar 28, 2022

Easy

1 vote84 runs0 comment

Which method of a vector adds an element to it?

Back-end developer

vectors

methods

Samuelat Mar 28, 2022

Easy

1 vote61 runs0 comment

What are the different parts of a function prototype in C++?

Back-end developer

functions

parameters

Samuelat Mar 28, 2022

Hard

1 vote55 runs0 comment

What does the following code display ? class A { public: virtual void hello() {cout << "A" << endl;} }; class B : public A { public: void hello() {cout << "B" << endl;} }; void meet_value(A a1, A a2) { a1.hello(); a2.hello(); } void meet_reference(A& a1, A& a2) { a1.hello(); a2.hello(); } int main() { B b; A a; meet_value(a, b); meet_reference(a, b); return 0; } Answer : "AAAB".

Back-end developer

inheritance

virtual functions

Samuelat Mar 28, 2022

Medium

1 vote47 runs0 comment

Write a C++ program that displays 111111.

Back-end developer

vector

references

Samuelat Feb 13, 2023

Medium

1 vote36 runs0 comment

What does the following code return ? int main() { int i = 1; int& j(i); i = 4; cout << j << endl; j = 6; cout << i << endl; return 0; }

Back-end developer

references

pointers

Samuelat Feb 27, 2023

42 interview questions on C++ - Fundamentalsfor developers (2025)

Test your technical skills before an interview of C++ - Fundamentals with 42 corrected questions. Beginner, Intermediate or Expert level.

Which statement concerning constructors is false ?

Write a C++ class with a constructor that takes two arguments.

How to distinguish a parameter of a method from an attribute of the class in C++

Which type should you use to represent a data list with a length that can change ?

The operator + has been defined for Complexe objects thanks to an intern overloading.

What is the default visibility of class members in C++?

Write a C++ program that uses static variables.

In C++, it is possible to give a default value to a parameter of a function and two functions can have the same name if their signatures are different but not only different on the return type.

Write a C++ program that displays a memory address.

Write a C++ program to add two complex numbers.

Print the message 'n = 10' in C++

What does the following code display ? class A { public: A() { f(); } virtual void f() { cout << "A" << endl; } }; class B : public A { public: void f() { cout << "B" << endl; } }; int main() { A a; B b; A* pa(&b); pa->f(); return 0; }

Which statement concerning the line ": rectangle(h, l), couleur(c)" is true ? class Rectangle {...} class Couleur {...} class RectangleColore { RectangleColore(double h, double l, Couleur c) : rectangle(h, l), couleur(c) {...} private: Rectangle rectangle; Couleur couleur; }

Write a function to display objects of type Complex.

How to use the logic operators AND / OR / NOT in C++

Which method of a vector adds an element to it?

What are the different parts of a function prototype in C++?

Write a C++ program that displays 111111.

What does the following code return ? int main() { int i = 1; int& j(i); i = 4; cout << j << endl; j = 6; cout << i << endl; return 0; }