In an activity diagram, the merge symbol has the same shape as what other symbol?

When used with ofstream objects, operator! is not:

a. Overloaded. b. Used to determine if the open operation succeeded. c. Used to close a file explicitly. d. Used to return a nonzero value if an error occurs.

In Visual Studio, the ____________ contains buttons that execute frequently used commands.

a. toolbox b. hot bar c. standard toolbar d. command bar