please help me to understand "extern" keyword in C/C++

Question

I'm just beginner for c/c++! I like to learn about how does work "extern" storage class specifier in c/c++ environment. I read a lot of tutorial about it but i cannot understand how it behave. Please help me to get clear idea about it! Thanks.

Answer 1

With extern you tell the compiler that a specific symbol is found in another compilation unit. The use will become clear to you when you work with projects that encompass multiple source files.