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

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();
10 min
Higher Order Function

As part of a data processing pipeline, complete the implementation of the makePipeline method:

  • The makePipeline method should accept a vector of functions, and it should return a new function that accepts one parameter arg.
  • The returned function should call the first function in makePipeline with the parameter arg, and call the second function with the result of the first function.
  • The returned function should continue calling each function in makePipeline in order, following the same pattern, and return the value from the last function.

For example,

std::vector<std::function<int (int)>> functions;
functions.push_back([] (int x) -> int { return x * 3; });
functions.push_back([] (int x) -> int { return x + 1; });
functions.push_back([] (int x) -> int { return x / 2; });
std::function<int (int)> func = makePipeline(functions);

and then calling func(3) should return 5.

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47 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, Book Sale, Fire Dragon, Battery, Weighted Average, Paper Strip, Node, Kilometer Converter, Unique Product, Archive, Function Cache, Veterinarian, Platformer, Hobbies, Date Transform, Out of Range, String Occurrence, Worker, Stories, Username, Window Manager, Document Store, Paragraph, Read Write Execute, Vectors, Animal Hierarchy, Sort Params, Flight Connections, Read First Line, Patient Class, Procedural Generator, Limits, Ship.

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
  • Sorting
  • Higher Order Function
  • Interfaces
  • Exceptions
  • Recursion
  • Method Overriding
  • Destructors
  • Hash and Equals
  • Queue
  • Data Structures
  • Iteration
  • Map
  • Regex
  • Strings
  • Stream
  • Dynamic Programming
  • Abstract Class
  • Pass by Reference
  • Random
  • Conditions

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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