Short-Answer Problems

True-False Problems

Indicate whether the following statements are true (T) or false (F):

1.  The body of a function is contained in braces.

    True, the body of a function is a { compound statement }

2.  The parameter list (or argument list) contains all variables used by
    the function.

    False, a function can also have internal local variables and can
    use global variables.

3.  In a call-by-value reference, a function cannot change the value of an
    actual parameter.

    True, all function arguments are passed by value.

4.  A static variable is declared inside a function, but it retains its
    value from one reference call to another.

    True

Multiple Choice Problems

Circle the letter for the best answer to complete each statement or for
the correct answer to each question.

5.  Which of the following is a valid function definition statement?
a. function cube(double x)
b. double cube(double x)	<<--
c. double cube(x)
d. cube(double x)

6.  In a function call, the actual parameters are separated by
a. commas.	<<--
b. semicolons.
c. colons.
d. spaces.

7.  The definition of the statements in which an identifier is known (or
    can be used) is
a. global.
b. local.
c. static.
d. scope.	<<--

Program Analysis

Use the following function for Problems 8-11:
/*-----------------------------------------------------------------*/
/*  This function returns 0 or 1.                                  */

int fives(int n)
{
  /*  Compute result to return.  */
  if ((n%5) == 0)
    return 1;
  else
    return 0;
}
/*-----------------------------------------------------------------*/

8.  What is the value of fives(15);

    15%5 is 0, so fives returns 1

9.  What is the value of fives(26);

    26%5 is 1, so fives returns 0

10. What is the value fives (ceil (sqrt (62.5))); (Hint: you don't need a
    calculator to determine this value.)

    ceil(sqrt(62.5)) ~= ceil(7.9) = 8

    8%5 is 3, so fives returns 0

11. Does this function work properly for all integers? If not, what are its
    limitations?

    mod (%) does not necessarily work correctly for negative values