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

Hard

4 votes512 runs

1 comment

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

Back-end developer

pointers

references

Abha Agrawaat Dec 3, 2021

Medium

3 votes504 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

Expert

2 votes531 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

2 votes526 runs

1 comment

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

Back-end developer

friend

class

Abha Agrawaat Dec 3, 2021

Medium

2 votes509 runs0 comment

What is the output of the following C++ code? #include <iostream> using namespace std; int main() { int a = 10, b = 20, c = 30; cout << a + b + c; return 0; }

Back-end developer

pointers

arrays

Abha Agrawaat Dec 3, 2021

Medium

2 votes483 runs0 comment

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

Back-end developer

pointers

arrays

Abha Agrawaat Dec 3, 2021

Medium

2 votes464 runs

1 comment

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

Back-end developer

array

constructor

Abha Agrawaat Apr 7, 2023

Hard

1 vote547 runs0 comment

What are templates in C++?

Back-end developer

templates

templates-c++

Abha Agrawaat Dec 3, 2021

Hard

1 vote532 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

Hard

1 vote526 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 vote524 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 vote503 runs2 comments

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 vote503 runs0 comment

C++ error: undefined reference to `r2'

Back-end developer

c++

error

Abha Agrawaat Nov 21, 2021

Expert

1 vote233 runs0 comment

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

Back-end developer

ezat Jan 23, 2024

Hard

0 vote547 runs0 comment

Define a set of C function prototypes.

Back-end developer

c++

functions

Abha Agrawaat Dec 3, 2021

Expert

0 vote539 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 vote534 runs0 comment

Undefined

Back-end developer

c++

Abha Agrawaat Dec 2, 2021

Hard

0 vote531 runs

2 comments

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

Back-end developer

c++

registers

Abha Agrawaat Nov 25, 2021

Hard

0 vote530 runs1 comment

Compile time error as object of class Circle cannot be created

Back-end developer

classes

objects

Abha Agrawaat Jul 19, 2024

Easy

0 vote530 runs0 comment

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

Back-end developer

array

index

Abha Agrawaat Dec 3, 2021

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

Test your technical skills before an interview of C++ with 39 corrected questions. Beginner, Intermediate or Expert level.

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

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

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 difference between a friend and a friend function in C++?

What is the output of the following C++ code? #include <iostream> using namespace std; int main() { int a = 10, b = 20, c = 30; cout << a + b + c; return 0; }

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

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

What are templates in C++?

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

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

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

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

C++ error: undefined reference to `r2'

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

Define a set of C function prototypes.

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

Undefined

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

Compile time error as object of class Circle cannot be created

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

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

Test your technical skills before an interview of C++ with 39 corrected questions. Beginner, Intermediate or Expert level.

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

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

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 difference between a friend and a friend function in C++?

What is the output of the following C++ code? #include <iostream> using namespace std; int main() { int a = 10, b = 20, c = 30; cout << a + b + c; return 0; }

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

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

What are templates in C++?

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

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

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

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

C++ error: undefined reference to `r2'

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

Define a set of C function prototypes.

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

Undefined

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

Compile time error as object of class Circle cannot be created

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

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; ```