A _________ function is not a member of the class, but has access to the private members of the class.

What will be the value of x after the following statements are executed?

``` int x = 10; for (int y = 5; y < 20; y +=5) x += y; ``` a. 25 b. 30 c. 50 d. 40

Use the unset (Sobell, page 314) builtin to remove myvar. Show that myvar is not available in the interactive shell or in the environment.

What will be an ideal response?