Embedded Systems and C Online Test

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About the test

The Embedded Systems and C online test assesses candidates' knowledge of embedded systems and the C programming language.

It's an ideal test for pre-employment screening. A good embedded systems/software engineer needs to know how to design, develop, test, and maintain embedded systems. They need to be familiar with hardware used for embedded systems, technologies used for connecting embedded devices and know how to develop software required to run the system using the C programming language.

This online test requires candidates to answer multiple-choice and fill the blanks questions about hardware and software used in embedded devices, and to solve coding problems in C.

Sample public questions

Easy
20 min
code
Public
AI-resistant
C
Arrays
Iteration

Your company is analyzing malware which targets numerical record files.

The malware uses a sliding window over the array of numbers in a file, and tries to match the following pattern:

Tl, -, -, X, -, -, -, Tr

The entire window is moved so that 'X' passes through all the values and is compared to the numbers at the 'Tl' and 'Tr' locations, which are positioned at a constant offset to 'X'.

The malware has the following rules:

  • If the value at the 'Tl' or 'Tr' position of the pattern is bigger or equal to the value at the 'X’ position, the malware replaces the value at 'X' with 0.
  • If the value at the 'Tl' or 'Tr' offset is out of bounds, then the value at 'X' is only compared to the other existing value.
  • The record is processed in two stages: first, all the positions that should be set to 0 are located, using the original values for comparison. Only after all positions have been identified do they get set to 0.

For example, if the values in a record file are the following:

{ 1, 2, 0, 5, 0, 2, 4, 3, 3, 3 }

The expected values after the malware runs are:

{ 1, 0, 0, 5, 0, 0, 0, 3, 3, 0 }

In this example, both '2's, the '4' and the last '3' were replaced by 0.

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

Easy
10 min
fill
Public
AI-resistant
Embedded Systems
Boolean Function
Logic Gates

You have a component which should be used as part of a signal processing device. It has four input pins, one output pin, and three slots where you can insert logical gates:

A diagram showing the logic gates and their connections

The component should have the following truth table:

In Out
A B C D E
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 0
0 1 0 1 1
0 1 1 0 1
0 1 1 1 0
1 0 0 0 0
1 0 0 1 1
1 0 1 0 1
1 0 1 1 0
1 1 0 0 0
1 1 0 1 0
1 1 1 0 0
1 1 1 1 0

Choose appropriate logic gates for the component's slots to achieve the required truth table.

1st slot: __ gate

2nd slot: __ gate

3rd slot: __ gate

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35 more premium Embedded Systems and C questions

Square, Descriptor, Copy Bit, Max Sum, Init Range, Increment, Internal Nodes, Battery, Strings Pointer, Allocate String, Count Letters, Segment, Storing Data, Smart Home, Water Level Sensor, USB, Read Write Execute, Sort Params, Run in Parallel, Peripheral Device, Digital Flasks, Planet Search, Shipping, Airport Networks, Company Stock, Flimsy Ladder, Calories Burned, Tiles, Weighted Average, Node, Racer, Chain Link, Paper Strip, Circuit Simulator, Vectors.

Skills and topics tested

  • C
  • Pointers
  • Memory Management
  • Bit Manipulation
  • Algorithmic Thinking
  • Arrays
  • Tree
  • Language
  • Pointer to Pointer
  • Strings
  • Arithmetic
  • Embedded Systems
  • Endianness
  • Number System Conversion
  • IoT
  • Wireless Connection
  • Stack Memory Allocation
  • Computer Bus
  • Wired Connection
  • Pass by Reference
  • Higher Order Function
  • Multithreading
  • Pthreads
  • Boolean Function
  • Logic Gates
  • Conditions
  • Iteration
  • 2D Array
  • Graphs
  • AI Code Review
  • Conditional Statements
  • Loops
  • Bug Fixing
  • Recursion
  • Synchronization
  • Linked List

For job roles

  • Back-End Developer
  • C Developer
  • Embedded Software Engineer
  • Embedded Systems Engineer

Sample candidate report

What others say

Decorative quote

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.

Jan Opperman, Grindrod Bank

Product reviews

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G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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