36 interview questions on C++ for developers (2025)

Hard

3 votes460 runs

1 comment

Write a C++ function that returns the sum of two integers.

Back-end developer

pointers

references

Abha Agrawaat Dec 3, 2021

Hard

3 votes455 runs0 comment

C++ is a general-purpose programming language. It was developed in the 1970s by Bjarne Stroustrup at Bell Labs.

Back-end developer

history

c++

Abha Agrawaat Dec 2, 2021

Hard

1 vote481 runs0 comment

Which of the following sets of code will cause a compile time error?

Back-end developer

c++

compile time error

Abha Agrawaat Dec 3, 2021

Hard

1 vote475 runs0 comment

What is the purpose of a static method in C++?

Back-end developer

c++

static

singleton

Abha Agrawaat Dec 3, 2021

Hard

1 vote454 runs0 comment

C++: what is the output of the following code? `std::cout << &obj << std::endl;`

Back-end developer

references

pointers

Abha Agrawaat Dec 3, 2021

Hard

1 vote454 runs0 comment

C++ error: undefined reference to `r2'

Back-end developer

c++

error

Abha Agrawaat Nov 21, 2021

Medium

1 vote428 runs0 comment

What is the output of the following C++ code?

Back-end developer

pointers

arrays

Abha Agrawaat Dec 3, 2021

Medium

1 vote422 runs0 comment

Write a C++ program that creates an array of 10 Person objects.

Back-end developer

array

constructor

Abha Agrawaat Apr 7, 2023

Expert

1 vote145 runs0 comment

Write a C++17 program that uses lambda and fold expressions.

Back-end developer

ezat Jan 23, 2024

Hard

0 vote505 runs0 comment

What are templates in C++?

Back-end developer

templates

templates-c++

Abha Agrawaat Dec 3, 2021

Hard

0 vote490 runs0 comment

Define a set of C function prototypes.

Back-end developer

c++

functions

Abha Agrawaat Dec 3, 2021

Expert

0 vote490 runs0 comment

What is the difference between a function declaration and a function prototype in C++?

Back-end developer

c++

function

declaration

Abha Agrawaat Nov 21, 2021

Easy

0 vote486 runs0 comment

C++ code to check if a number is between 0 and N

Back-end developer

array

index

Abha Agrawaat Dec 3, 2021

Hard

0 vote482 runs1 comment

What is the value of a pointer to a function that has not been defined?

Back-end developer

pointers

memory

Abha Agrawaat Mar 5, 2024

Hard

0 vote481 runs1 comment

What is the result of the following code? #define CONSTANT 10; int main() { return CONSTANT; }

Back-end developer

preprocessor

header

constants

Abha Agrawaat Nov 8, 2023

Easy

0 vote480 runs0 comment

Undefined

Back-end developer

c++

Abha Agrawaat Dec 2, 2021

Hard

0 vote478 runs1 comment

What is the purpose of the keyword `register` in C++?

Back-end developer

c++

registers

Abha Agrawaat Nov 25, 2021

Hard

0 vote474 runs0 comment

How to determine the type of a variable at runtime in C++

Back-end developer

dynamic_cast

type

Abha Agrawaat Nov 25, 2021

Expert

0 vote470 runs2 comments

What is the value of p1 and q1 in the following code? ```c++ int i = 0; int p = &i; int const p1 = &i; int const q1 = &p; ```

Back-end developer

pointers

references

Abha Agrawaat Mar 5, 2024

Hard

0 vote469 runs0 comment

What is the output of the following code?

Back-end developer

inheritance

access specifiers

Abha Agrawaat Nov 25, 2021

36 interview questions on C++for developers (2025)

Test your technical skills before an interview of C++ with 36 corrected questions. Beginner, Intermediate or Expert level.

Write a C++ function that returns the sum of two integers.

C++ is a general-purpose programming language. It was developed in the 1970s by Bjarne Stroustrup at Bell Labs.

Which of the following sets of code will cause a compile time error?

What is the purpose of a static method in C++?

C++: what is the output of the following code? `std::cout << &obj << std::endl;`

C++ error: undefined reference to `r2'

What is the output of the following C++ code?

Write a C++ program that creates an array of 10 Person objects.

Write a C++17 program that uses lambda and fold expressions.

What are templates in C++?

Define a set of C function prototypes.

What is the difference between a function declaration and a function prototype in C++?

C++ code to check if a number is between 0 and N

What is the value of a pointer to a function that has not been defined?

What is the result of the following code? #define CONSTANT 10; int main() { return CONSTANT; }

Undefined

What is the purpose of the keyword `register` in C++?

How to determine the type of a variable at runtime in C++

What is the value of p1 and q1 in the following code? ```c++ int i = 0; int p = &i; int const p1 = &i; int const q1 = &p; ```

What is the output of the following code?

36 interview questions on C++for developers (2025)

Test your technical skills before an interview of C++ with 36 corrected questions. Beginner, Intermediate or Expert level.

Write a C++ function that returns the sum of two integers.

C++ is a general-purpose programming language. It was developed in the 1970s by Bjarne Stroustrup at Bell Labs.

Which of the following sets of code will cause a compile time error?

What is the purpose of a static method in C++?

C++: what is the output of the following code? `std::cout << &obj << std::endl;`

C++ error: undefined reference to `r2'

What is the output of the following C++ code?

Write a C++ program that creates an array of 10 Person objects.

Write a C++17 program that uses lambda and fold expressions.

What are templates in C++?

Define a set of C function prototypes.

What is the difference between a function declaration and a function prototype in C++?

C++ code to check if a number is between 0 and N

What is the value of a pointer to a function that has not been defined?

What is the result of the following code? #define CONSTANT 10; int main() { return CONSTANT; }

Undefined

What is the purpose of the keyword `register` in C++?

How to determine the type of a variable at runtime in C++

What is the value of p1 and q1 in the following code? ```c++ int i = 0; int *p = &i; int *const p1 = &i; int *const q1 = &*p; ```

What is the output of the following code?

What is the value of p1 and q1 in the following code? ```c++ int i = 0; int p = &i; int const p1 = &i; int const q1 = &p; ```