Introduction

We’re hiring a new programmer and it’s your job to test them. Can you think of some interesting questions that would give us insight into their abilities as a developer? Here are five OS/System programming interview questions and answers.

How do you find the longest line in a text file?

The best way to find the longest line in a text file is by using a stack, queue or hash table.

A stack is an ordered list where operations are performed on the topmost element (called a “top”). It allows only one operation at a time but it has no limit on how many elements can be added to it or removed from it. For example, if you want to add an element onto your stack and it already has four items there then you have no choice but to remove another item from somewhere else in order for room for your new addition.

A queue is another type of collection that has first-in first-out order (FIFO). This means that when adding something new into this type of collection, all previous items will move down towards its end until they reach their proper position again at which point all future additions will begin filling up space near where they originally were placed within said queue’s structure so long as nothing else happens between now and then like removing one piece without replacing them with another one right away instead; otherwise everything gets messed up!

Can you write a program that can tell whether a given number is divisible by 3 or not?

The following code can be used to check if a given number is divisible by 3 or not:

def divisible_by_3(num):

while num > 0:

if num % 3 == 0:

return True

What do you know about memory management?

Memory management is the process of allocating and deallocating memory in a computer system. It’s also important for performance, because if you don’t have enough memory available, your computer will slow down. There are several ways to manage memory:

• Manual – Memory can be managed manually by using malloc() and free(). This is often done at compile time when you’re writing code yourself; however, it can also be done at run time if you’re doing it with C++ or another high-level language such as Java or Python (whereas lower-level languages like Assembly do not allow this).
• Automatic – An operating system provides its own automatic allocation system that allocates memory as needed without any action on your part (but still freeing up unused blocks). This type of management happens both at compile time and run time depending on whether or not it’s done by the operating system itself or some other component within its environment (like an application framework).

Is there any difference between 4GB and 4GB-1GB?

The difference between 4GB and 4GB-1GB is 1 GB. The same applies to any other combination of numbers. For example, if you have 7 GB of RAM, then:

• 4GB = 3 GB (4 x 1024 MB)
• 5GB = 4 GB (5 x 1024 MB)

You have two functions defined as follows, with some numbers passed to each:

You have two functions defined as follows, with some numbers passed to each:

• The first function is called divide_by_3, and it takes a number, divides it by 3 and returns the result.
• The second function is called multiply_by_6, and it takes a number, multiplies it by 6, and returns the result.

Takeaway:

• How to find the longest line in a text file?
• What do you know about memory management?
• Is there any difference between 4GB and 4GB-1GB?

Conclusion

There you have it, five OS interview questions with answers. I hope this article has helped you prepare for your next interview! If you have any questions, feel free to reach out in the comments below.