Garmin interview question

Explain pointers and when you could user a double pointer. Follow exponential drawing code. (Error with semi-colon after the for loop. And reason through it. What is a mutex and semaphore. How are they used. Basic buffer operations in OS. How to handle deadlock and context switch. Coding question on the use of pointers and passing by reference (* and &) using a class. Class c1, *c2, &c3. Coding question about parsing through Cstring in C. Turn a string into an integer and output it based on test cases.