Embedded Systems and C Online Test
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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
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.
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:
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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31 more premium Embedded Systems and C questions
Square, Descriptor, Copy Bit, Shipping, Max Sum, Init Range, Increment, Internal Nodes, Battery, Strings Pointer, Allocate String, Count Letters, Segment, Tiles, Storing Data, Smart Home, Water Level Sensor, USB, Read Write Execute, Weighted Average, Node, Racer, Sort Params, Run in Parallel, Chain Link, Paper Strip, Flimsy Ladder, Circuit Simulator, Peripheral Device, Vectors, Calories Burned.
Skills and topics tested
- C
- Pointers
- Memory Management
- Bit Manipulation
- Arithmetic
- Algorithmic Thinking
- Arrays
- Tree
- Language
- Pointer to Pointer
- Strings
- 2D Array
- Pass by Reference
- Embedded Systems
- Endianness
- Number System Conversion
- IoT
- Wireless Connection
- Stack Memory Allocation
- Computer Bus
- Wired Connection
- Bug Fixing
- Recursion
- Multithreading
- Synchronization
- Higher Order Function
- Pthreads
- Linked List
- Iteration
- Conditions
- Boolean Function
- Logic Gates
For job roles
- Back-End Developer
- C Developer
- Embedded Software Engineer
- Embedded Systems Engineer
Sample candidate report
What others say
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
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