C++ Interview Questions and Answers

C++ Interview Questions for Experienced Candidates

Q1.Choose the correct syntax in the operator conversion

1. operator float()
2. operator const
3. operator float()const
4. None of the above

Answer: c. operator float()const

Q2. Choose the header file that is used while declaring standard library algorithms?

1. algorithm
2. container
3. library
4. None of the above

Answer: a. Algorithm

Explanation: Algorithms are used to perform algorithmic operations on sequences in a C++ standard library. So, the answer is algorithm to create a header file.

Q3. What is the output of this program?

#include <iostream>

int main(int argc, char **argv)

{

std::cout << 25u - 50;

return 0;

}

Answer: 4294967271

Explanation: In C++, if the two operands are different, then the “lower type” will be converted to “higher type” using type hierarchy. In this case, we have, (unsigned int) 25u and (int) 50. So, 50 also becomes unsigned integer (50u). So, the result of the 25u - 50u will be an unsigned integer, which converts to 4294967271.

Q4. Choose the valid declaration for overloading ++ in postfix form where T is the class name.

1. T operator++();
2. T operator++(int);
3. T& operator++();
4. T& operator++(int);

Ans: b – T operator++(int);

Q5. Which feature of the OOPS gives the concept of reusability?

1. Abstraction
2. Encapsulation
3. Inheritance
4. None of the above

Ans: c. Inheritance

Q6. i) Exception handling technically provides multi branching.

      ii) Exception handling can be mimicked using ‘goto’ construct.

1.   Only (i) is true
2.   Only (ii) is true
3.   Both (i) & (ii) are true
4.   Both (i) && (ii) are false

Ans: a. Only (i) is true

Q7. Which of the following is a pure virtual function definition?

1. virtual void f()=0 { }
2. void virtual f()=0 { }
3. virtual void f() {} = 0;
4. None of the above

Ans: d. None of the above

Q8. What is the output of the following program?

#include<iostream>

using namespace std;

class abc {

   public:

   int i;

   abc(int i) {

      i = i;

   }

};

main() {

   abc m(5);

   cout<<m.i;

}

1.   5
2.   Garbage
3.   Error in the statement i=i;
4.   Compile error: ‘i’ declared twice

Ans: b. Garbage

Improve Recruitment Efficiency with Online Coding Assessments

Compared to traditional recruitment methods, online assessment methods use scientifically designed tools to assess domain-specific skills. Apart from aptitude, coding skills can also be evaluated using online assessment platforms.  Almost all the features are automated, which assures accuracy in test results and helps to filter out less suitable candidates. When C++ interview questions are incorporated during the pre-hiring aptitude test rounds, it helps to filter out candidates who don't have a good understanding of these basic concepts. This way only the most eligible candidates needs to be interviewed, saving time and efforts.

Updating your recruitment process becomes easy with online automated coding assessment platforms offered by MeritTrac. Recruiters from any background can efficiently administer the test, gather the test results and share them with decision-makers.  

Applications of MeritTrac Assessment Solutions

MeritTrac’s assessment solutions are widely used to simplify mass hiring recruitment needs where a large number of candidates are evaluated in a single day. Conducting high-volume recruitment through traditional methods are extremely challenging, and the results are often delayed. This delay leads to losing good candidates to competitors and creates room for inefficient and biased decisions during hiring. With online assessment platforms, there is very less scope for bias or delay as the test processes are automated, ensuring quick and accurate decision making.

When it comes to lateral hiring, MeritTrac’s assessment solutions provide clarity on who has the right C++ skills and is eligible for handling new responsibilities. It also helps employees who lack key skills to improve themselves by analysing their test results. When employee test reports are shared with the learning and development team, they will be able to create high-quality training programs. They will also be able to create personalised programs to help individual employees to upskill themselves.