# Embedded Systems and C Online Test

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The Embedded Systems and C online test assesses knowledge of embedded systems and the C programming language. This test includes solving live coding problems in C.

The assessment includes solving work-sample tasks, such as:

• Understanding how a call stack works in C.
• Filling the truth table for a digital system made of logic gates.

A good embedded systems/software engineer needs to have knowledge of hardware used for embedded systems and devices, and should know how to develop software required to run the system using the C programming language.

## Sample public questions

Easy
15 min
code
Public
AI-resistant
C
Arithmetic
Arrays
Iteration

A gaming company is working on a platformer game. They need a method that will compute the character's final speed, given a map and a starting speed.

The terrain on which the game character moves forward is made from various pieces of land placed together. Implement the method calculate_final_speed which takes the initial speed of the character, and an array of degrees of inclination that represent the uneven terrain.

The speed of the character will increase or decrease proportionally to the incline of the land, as shown in the image below:

The magnitude of the angle of inclination will always be < 90°. The speed change occurs only once for each piece of land. The method should immediately return 0 as the final speed if an incline reduces the speed to 0 or below 0, which makes the character lose 1 life.

For example, the below code:

``````int inclinations[] = { 0, 30, 0, -45, 0 };
int array_length = sizeof(inclinations) / sizeof(inclinations[0]);
printf("%.2f\n", calculate_final_speed(60, inclinations, array_length));``````

should print:

``75.00``
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:

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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### 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
• Boolean Function
• Logic Gates
• AI Code Review
• Conditional Statements
• Loops
• 2D Array
• Bug Fixing
• Synchronization
• Iteration
• Recursion
• Conditions
• Graphs

### For job roles

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

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## 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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