Top 10 C++ Coding Questions for Technical Interviews

 If you are preparing for a technical round, mastering C++ is essential. Many companies, from startups to FAANG, test your problem-solving ability using C++ due to its efficiency and control over system resources. In this blog, we’ll explore the top 10 cpp interview questions you must practice before your next interview.

1. Reverse a String in C++

Problem: Write a program to reverse a given string without using in-built functions.

Why it’s asked: Tests understanding of loops, pointers, and string manipulation.

2. Check for a Palindrome

Problem: Determine whether a given string or number is a palindrome.

Why it’s asked: Interviewers assess your ability to manipulate strings and handle edge cases.

3. Find Factorial Using Recursion

Problem: Write a recursive function to calculate the factorial of a number.

Why it’s asked: Recursion is a must-know for any coding interview. This checks both recursion and base case handling.

4. Fibonacci Series

Problem: Print the first n terms of the Fibonacci series using both recursion and iteration.

Why it’s asked: Tests efficiency—recursive solutions are straightforward but not optimal, while iterative ones save memory.

5. Find the Largest and Smallest Element in an Array

Problem: Given an array, find the minimum and maximum values.

Why it’s asked: A basic question to check array traversal skills and complexity understanding.

6. Implement Binary Search

Problem: Implement binary search for a sorted array.

Why it’s asked: Tests understanding of divide-and-conquer algorithms and time complexity.

7. Sort an Array Using QuickSort

Problem: Implement QuickSort in C++.

Why it’s asked: Sorting is fundamental. QuickSort demonstrates recursion, partitioning, and efficiency.

8. Detect a Cycle in a Linked List

Problem: Check whether a linked list has a cycle.

Why it’s asked: This is a common data structure problem. It checks knowledge of linked lists and algorithms like Floyd’s Cycle Detection.

9. Implement a Stack Using Arrays

Problem: Create a stack class with push, pop, and peek operations.

Why it’s asked: Fundamental to understanding abstract data types and memory management.

10. Find the First Non-Repeating Character in a String

Problem: Write a program to find the first character in a string that does not repeat.

Why it’s asked: Tests knowledge of hashing, frequency counting, and string traversal.

Final Thoughts

Practicing these cpp interview questions will help you build confidence and problem-solving speed. Make sure you not only code them but also analyze their time and space complexities. Remember, interviewers look for clarity of thought, optimized solutions, and clean coding practices.

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