Top 5 Embedded C Questions

April 2, 2023

Due to its system compatibility, simplicity, and efficiency, embedded C is the language that is used the most frequently. In most cases, embedded C offers ample abstractions for interacting with hardware resources. It's a good idea to comprehend and practice Embedded C Questions. Use the most important C questions listed below as a guide to succeeding in your next interview.

What is Embedded C? What does "Embedded C language" mean?

The C Standards Committee has specified a set of language extensions called embedded C for the C programming language. It is typically used to overcome issues with the commonality that arise with C extensions for various embedded systems.

In order to enable advanced microprocessor features like fixed-point arithmetic, several different memory banks, and fundamental I/O operations, embedded C programming generally necessitates nonstandard additions to the C language.

What does the term "volatile" in Embedded C mean, and how is it used?

The type qualifier volatile instructs the compiler to refrain from optimizing the objects in embedded C. According to the C standard, the tumultuous type object may be altered in ways that the implementation is unaware of.

In other words, a volatile object's value may be updated whenever necessary without modifying the code. The compiler loads a volatile object's value from memory each time a program calls on it. Only memory reading can establish whether a value has changed randomly.

How does a C segmentation failure error look? Which common factors lead to the segmentation fault error?

A segmentation fault error is a runtime error that can happen when a program is executed for various reasons. The list of typical reasons for the segmentation fault error in C is provided below:

  • Using a pointer that might not point to a valid address or location in memory could result in a segmentation fault problem.
  • The software might issue a segmentation fault error if you attempt to access a read-only memory area.
  • When you use a pointer to try to release memory that has already been freed, a segmentation fault error could also occur.
  • The occurrence of a segmentation fault error is the cause of a stack overflow error in C.

Does the ISR have the ability to receive any parameter and return a value?

No. It cannot change a parameter while expecting the ISR to return a value. Neither does the ISR return anything, nor does it accept any parameters. When a hardware or software event occurs, it is called instead of the code actually calling an ISR.

Hence, no parameters are sent to an ISR. Because the code doesn't call the ISR, there isn't a contact code to retrieve its returned values. Hence, an ISR doesn't return anything.

What does "dangling pointer" mean in embedded C?

A pointer that directs the user to a memory address that the application has already freed and is no longer in use is called a dangling pointer. Dangling pointers are initialized pointers that the programmers occasionally fail to initialize with a proper address.

Dangling pointers are produced when an item is removed or released from memory without updating the value of the pointer. There is a chance that a runtime error will occur if you attempt to dereference a dangling pointer.


We truly hope these interview questions and answers for embedded systems will help you answer interview questions. Be well-prepared to master the interview and land a job as an embedded programmer by being familiar with all the answers to these embedded system interview questions.

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