After forking, are global variables shared?

Question

Consider this simple code:

 int myvar = 0;
 int main() {
     if (fork()>0) {
       myvar++;
     } else {
       // father do nothing
     }
 }
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Answer 1

After fork(), the entire process, including all global variables, is duplicated. The child is an exact replica of the parent, except that it has a different PID(Process Id), a different parent, and fork() returned 0. Global variables are still global within its own process. So the answer is no, global variables are not shared between processes after a call to fork().