Does At symbol (@) and Dollar Sign ($) has any special meaning in C or C++

Question

Recently one of my friend encountered this question in an interview. The interviewer asked him if the special characters like $, @, |, ^, ~ have any usage in c

Answer 1

To complete the accepted answer, the @ can be used to specify the absolute address of a variable on embedded systems.

unsigned char buf[128]@0x2000;

Note this is a non-standard compiler extension.

Check out a good explanation here