010 CS Intro to Computer Science I
Spring - 2008
Quiz 8 Friday 5/30
SOLUTION
1. What is the value of inner_count after the following code executes?
(Assume n and m have been previously declared and assigned values, and inner_count & outer_count declared & initialized to 0). for (int i = 0; i < n; i++){ outer_count++; for (int j = 0; j < m; j++){ inner_count++; } }
a. 0 b. n c. m d. n + m e. n * m f. n + m + 1
2. Which of the following statements has a syntax error, given n1 is an integer variable, d1 is
a double variable, and s1 is a string variable?
a. n1 = func1(10, 20.0, "abc"); b. cout <<
func1(func2(n1),d1,s1); c. if (func3(n1)) cout << s1;
d. func2(n1); e. func2(func1(n1, d1, s1)); f. b) and e)
3. Which is the BEST choice for the declaration of a function which raises the salary of an
Employee object by raise %?
a. b. c. d. e. f.
Employee raise_sal(double); void raise_sal(Employee&, double); void raise_sal(const Employee&, double); Employee raise_sal(Employee&, double); void raise_sal(Employee&, double&); int raise_sal(Employee, double);
4. Which of the following conditional expressions is exactly equivalent to:
( !(country == "USA" and state != "AK" and state != "HI") )
a. b. c. d. e. f.
( ( ( ( ( ( country country country country country country != == != == == == "USA" "USA" "USA" "USA" "USA" "USA" or state == "AK" or state == "HI" ) or state == "AK" or state == "HI" ) and state == "AK" and state == "HI" ) and state == "AK" and state == "HI" ) or state != "AK" or state != "HI" ) and state != "AK" and state != "HI" )
5. The function rand(), defined in the <cstdlib> library, generates "pseudo-random"
numbers. Which of these expressions would return a value random in the range (0.000, 0.999)?
a. ( rand() % 1000 ) / 1000 b. ( rand() % 1 ) / 1000 c. ( rand() / 1000 ) d. ( rand() % 1 ) e. ( rand() % 1000 ) / 1000.0 f. ( rand() / 1000.0 ) % 1000
6. A function that is effectively empty and returns a trivial value is often used to allow a
program to compile while testing the main or other parts of the program. It is called:
a. an algorithm b. an abstraction c. a black box d. a driver e. a stub f. a unit test
7. A "test harness" is used to perform unit tests on a program. Which of the following can
provide appropriate test coverage?
a. Keyboard input b. File input c. Sequential values generated in a loop d. Randomly generated values e. All of the above f. None of the above
8. If x is negative, the statement assert(x >= 0); a. does nothing. b. outputs a warning and continues executing the program. c. outputs a warning, sets x equal to 0 and continues executing the program. d. terminates the program, and displays the file name, line number, and expression. e. returns the value false. f. aborts the function in which the statment occurs 9. Which of the following expressions would you use to test input from the keyboard for
validity?
a. valid(cin) b. cin.valid() c. fail(cin) d. cin.fail() e. cin << fail f. either c) or d)
10. A global variable is: a. a variable that is declared in the main function b. a variable that is declared as datatype "global" c. a variable that is declared inside a function of global scope d. a variable that is declared outside of any function e. available to all functions declared after it f. both d) and e) 11. What level of programming experience did you have coming into this course?
(Note: please answer ALL that apply)
a. b. c. d. e. f.
Basic computer literacy, no programming knowledge at all HTML JavaScript Visual Basic or MatLab (High School course or equivalent) Java (High School course or equivalent) C++ (High School course or equivalent)