1 coding round.

Telephonic interview questions:

• Bitwise AND of 2 numbers.
• Flip the ith bit (without using ~).
• Check if balanced parentheses: ())() {[]}.
• Regex for +6512345678 (i.e., +65 followed by 8 digits).
• Stream of digits: How to print the average of the last n digits? How big can n be?
• Debugger features? What is a stack frame?
• How can you find an application running on a port?
• You are writing code for a client which downloads files from a server. How do you restrict the file size (e.g., not allow download of more than 500KB)? (Hint: using HTTP)

Some questions were easy, some were quite confusing.

Bitwise AND of two numbers.

Flip the ith bit without using the bitwise NOT operator (~).