Question

name an error present in the following pseudocode. start declarations global num merchcost output \enter purchase total: \ input merchcost calculatesalestax() output \please pay \, (merchcost + salestax) stop calculatesalestax() declarations num salestax num taxrate = .08 salestax = taxrate * merchcost return a. the main program declares only global variables. b. the module attempts to use a variable that is out of scope. c. the main program attempts to use a variable that is out of scope. d. the module is never called by the main program.

Explanation:

In the calculateSalesTax module, the variable merchCost is used without being passed in or declared locally. It is declared as a global variable in the main program but the module has its own scope rules and this usage causes a scope - related error.

Answer:

B. The module attempts to use a variable that is out of scope.