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

Hard

3 votes498 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 votes489 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

3 votes488 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 votes514 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 votes511 runs0 comment

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

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friend

class

Abha Agrawaat Dec 3, 2021

Medium

2 votes462 runs0 comment

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

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pointers

arrays

Abha Agrawaat Dec 3, 2021

Medium

2 votes453 runs0 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 vote533 runs0 comment

What are templates in C++?

Back-end developer

templates

templates-c++

Abha Agrawaat Dec 3, 2021

Hard

1 vote520 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 vote512 runs0 comment

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

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c++

compile time error

Abha Agrawaat Dec 3, 2021

Hard

1 vote510 runs0 comment

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

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c++

static

singleton

Abha Agrawaat Dec 3, 2021

Medium

1 vote496 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

Hard

1 vote488 runs0 comment

C++ error: undefined reference to `r2'

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c++

error

Abha Agrawaat Nov 21, 2021

Expert

1 vote208 runs0 comment

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

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ezat Jan 23, 2024

Hard

0 vote532 runs0 comment

Define a set of C function prototypes.

Back-end developer

c++

functions

Abha Agrawaat Dec 3, 2021

Expert

0 vote530 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

Hard

0 vote519 runs

1 comment

What is the output of the following code?

Back-end developer

pointers

references

Abha Agrawaat Dec 3, 2021

Easy

0 vote518 runs0 comment

Undefined

Back-end developer

c++

Abha Agrawaat Dec 2, 2021

Easy

0 vote516 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 vote515 runs1 comment

Compile time error as object of class Circle cannot be created

Back-end developer

classes

objects

Abha Agrawaat Jul 19, 2024

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.

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?

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++?

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; }

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++?

What is the output of the following code?

Undefined

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

Compile time error as object of class Circle cannot be created

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.

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?

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++?

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; }

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++?

What is the output of the following code?

Undefined

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

Compile time error as object of class Circle cannot be created

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; ```