C++ Online Test

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About the test

The C++ online test assesses knowledge of programming in the C++ language and commonly used parts of the C++ Standard Library. This test requires solving live coding problems in C++.

The assessment includes work-sample tasks such as:

  • Implementing and properly using algorithms and data structures to optimize application performance.
  • Optimizing memory management and fixing memory leaks.
  • Working with OOP principles and higher-order functions to write reusable code.

A good C++ developer needs a solid understanding of the C++ programming language and the ability to take advantage of the functionality provided by the Standard Library to write robust and maintainable code.

Sample public questions

20 min

Your company is analyzing malware software which targets numerical record files.

The malware checks the value of each record and the values of some of its neighbors. The record is replaced by 0 when it is smaller or equal to either of those neighbors.

For each number, it matches the following pattern, where position 'X', is compared to positions 'T':

T, _, _, X, _, _, _, T

Positions '_' represent neighbors that are ignored. Positions further beyond the 'T's, to the far left or far right, are also ignored.

If the 'X' position is near the left or right border and has no 'T' position neighbor, only one side is considered.

The malware finds all the positions first and only then sets them to 0. For example, if the values in a record file are the following:

{19, 2, 0, 87, 1, 40, 80, 77, 77, 77, 77}

The expected values after the malware runs are:

{19, 0, 0, 87, 0, 0, 0, 77, 77, 0, 0}

In this example, number 2 was removed because 40 is the bigger number.

Implement the simulate function so that the malware behavior is replicated for further study.

15 min
Algorithmic Thinking
Linked List
Unordered Set

A playlist is considered a repeating playlist if any of the songs contain a pointer to a previous song in the playlist. Otherwise, the playlist will end with the last song which points to NULL.

Implement a function isInRepeatingPlaylist that, efficiently with respect to time used, returns true if a playlist is repeating or false if it is not.

For example, the following code prints "true" as both songs point to each other.

Song* first = new Song("Hello");
Song* second = new Song("Eye of the tiger");

std::cout << std::boolalpha << first->isInRepeatingPlaylist();

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52 more premium C++ questions

Non Zero, Babushka Doll, Max Sum, Shipping, Unique Numbers, Moving Total, Increment, Crop Ratio, Stack to Vector, Internal Nodes, Segment, Chain Link, Tiles, Language Teacher, Friend, Fire Dragon, Battery, Weighted Average, Paper Strip, Node, Kilometer Converter, Unique Product, Archive, Function Cache, Veterinarian, Platformer, Hobbies, Out of Range, String Occurrence, Worker, Stories, Username, Window Manager, Document Store, Paragraph, Read Write Execute, Animal Hierarchy, Sort Params, Flight Connections, Read First Line, Patient Class, Procedural Generator, Limits, Ship, Circuit Simulator, Construction Game, Flimsy Ladder, Chemical Machine, Calories Burned, Vectors, Date Transform, Book Sale.

Skills and topics tested

  • C++
  • Bug Fixing
  • Language
  • Memory Management
  • Algorithmic Thinking
  • Arithmetic
  • Unordered Map
  • Unordered Set
  • Arrays
  • Pointers
  • Integer Division
  • Complexity
  • Stack
  • Vector
  • Tree
  • Linked List
  • Inheritance
  • OOP
  • Graphs
  • Higher Order Function
  • Interfaces
  • Exceptions
  • Recursion
  • Method Overriding
  • Destructors
  • Hash and Equals
  • Queue
  • Data Structures
  • Iteration
  • Map
  • Stream
  • Strings
  • Dynamic Programming
  • Regex
  • Abstract Class
  • Pass by Reference
  • Random
  • Conditions
  • Sorting

For job roles

  • Back-End Developer
  • C++ Developer

Sample candidate report

What others say

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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