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
A turn-based strategy game has a grid with water and land. The grid contains a true value where it's water and false where it's land.
The player controls a boat unit with a particular movement pattern. It can only move to fixed destinations from its current position as shown in the image below:
The boat can only move in a direct path through water to the possible destinations, so a destination will become unreachable if there is land in the way.
Implement the can_travel_to function, that checks whether a destination is reachable by the boat. It should return true for destinations that are reachable according to the pattern above, and false for unreachable or out of bounds destinations which are outside the grid.
For example, consider the following code:
bool game_matrix[6][6] = {
{false, true, true, false, false, false},
{true, true, true, false, false, false},
{true, true, true, true, true, true},
{false, true, true, false, true, true},
{false, true, true, true, false, true},
{false, false, false, false, false, false},
};
printf("%d\n", can_travel_to((bool*) game_matrix, 6, 6, 3, 2, 2, 2)); // true, Valid move
printf("%d\n", can_travel_to((bool*) game_matrix, 6, 6, 3, 2, 3, 4)); // false, Can't travel through land
printf("%d\n", can_travel_to((bool*) game_matrix, 6, 6, 3, 2, 6, 2)); // false, Out of bounds
The following image shows valid and invalid destinations when the boat is in the position (3, 2):
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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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, 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, Circuit Simulator, Peripheral Device, Vectors, Calories Burned, Digital Flasks, Planet Search, Shipping, Airport Networks, Company Stock, Flimsy Ladder.
Skills and topics tested
- C
- Pointers
- Memory Management
- Bit Manipulation
- Algorithmic Thinking
- Arrays
- Tree
- Language
- Pointer to Pointer
- Strings
- Arithmetic
- 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
- Conditions
- Boolean Function
- Logic Gates
- Iteration
- Graphs
- AI Code Review
- Conditional Statements
- Loops
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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