1) Tell me about yourself 2) Describe one of your projects. Then he spent about half an hour over that project asking questions about hardware! software, libraries, etc. 3) Difference between macro and function. 4) Define a macro for a maximum of 3 numbers. Optimize it. Gave some cases to dry run them. 5) Code to set the 20th bit of an integer. 6) Storage classes 7) What is static variable? Where they are used? Why it does not change it's value? 8) Static functions 9) One static variable is defined in file.c.Call it in another file2.c (I didn't know answer of this question but after this interview I googled it and then this question was asked to me again in second interview) 10) Function pointer and their use. Declare and call a function pointer. 11) Difference between structure and union and structure and class. 12) Code for nested structure and call it. 13) Time complexity concept.
