Top 7 Coding Interview Questions

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In this e-book I present 7 important programming tasks, which are typically asked in a job interview. With the knowledge from this book it will be easy for you to convince yours of your competence and to get the job!

Fibonacci Series

The question about the Fibonacci algorithm is a typical question in job interviews. Even if it seems relatively simple at first, the questioner can ask detailed questions about how the algorithm works, which will be answered in this book.

Sum of Digits of Given Number

Another typical question in job interviews is to ask for an algorithm to calculate the sum of the digits of a given number.

Swap two Numbers Without Using a Third Variable

In this chapter I would like to present a relatively simple but important question in a job interview. This question examines whether the job candidate can improvise and also cope with unexpected questions.

Merging Two Unsorted Arrays in Sorted Order

The next question we will look at is whether you can work with arrays. An array is a simple and frequently used data structure which every programmer should be familiar with. Therefore, the knowledge will be tested in programming interviews.

Remove All Vowels From a String

The next task, which is often asked in interviews, deals with strings. The task is to remove all vowels from a given string. There are different approaches. For example, you can use existing libraries of the programming language skillfully. This is a perfectly correct approach, but the interviewer will usually insist that you solve the task manually using only basic elements like loops, lists or arrays. Therefore, it is important to be able to solve this task algorithmically without relying on the built-in resources of a programming language.

Find the GCD of Two Integers

Another common question in a job interview tests your mathematical skills. The task is to find the greatest common divisor (gcd) of 2 positive numbers. Together we will briefly discuss the mathematical basics of the greatest common divisor and look at different solutions.

Count and Sort Chars in a String

Another typical task in a job interview is to check how well you can handle strings. Working with strings is indispensable in the daily programming business, therefore it is important to know many tasks around strings.

In this task, the focus is on examining the individual characters of a string and remembering them. It is important to know the necessary programming language tools to solve this task efficiently.