I had a phone interview with the 5G team. I am still waiting to hear back; it should take about 10 days.

I wanted to put this up for reference (for the questions).

(I will check "Yes" for good luck : - ))

How does casting work in C (memory)?

Difference between big-endian vs. little-endian? How can you tell if the machine you are coding on is big-endian or little-endian?

Union vs. struct: How does a union work in memory?

How does struct padding work? Where are the extra bytes stored in memory? (4 bytes aligned)

Was asked to find the errors in some C code:

• Returning stack pointer
• Allocating a huge array on the stack
• Integer overflow

Given a sorted array, check whether a number exists (use binary search, let me use Python).

Given a string with numbers and letters, remove all the non-numbers from the string and convert that string to an int in C.

Basic OS stuff: What is multithreading? What is a mutex, and why do you need it? What is deadlock? Do threads share the same stack?