CSCI Ch 5

38) This may be used to write information to a file. A) cout object B) pen object C) output object D) stream insertion operator E) None of these

D

12) A loop that is inside another loop is called: A) an infinite loop B) a pre-test loop C) a post-test loop D) a nested loop E) None of these

D

13) This statement may be used to stop a loop's current iteration and begin the next one. A) break B) terminate C) re-iterate D) continue E) None of these

D

14) True/False: It is possible to define a file stream object and open a file in one statement.

TRUE

4) True/False: An initialization expression may be omitted from the for loop if no initialization is required.

TRUE

6) True/False: If you want to stop a loop before it goes through all its iterations, the break statement may be used.

TRUE

9) True/False: The update expression of a for loop can contain more than one statement, e.g. counter++, total+= sales.

TRUE

8) A for statement contains three expressions: initialization, test, and A) update B) reversal C) null D) validation E) None of these

A

16) Look at the following statement. while (x++ < 10) Which operator is used first? A) ++ B) < C) Neither. The expression is invalid.

B

21) This is a special value that marks the end of a list of values. A) constant B) variable C) loop D) sentinel E) None of these

D

1) True/False: The increment and decrement operators can be used in mathematical expressions; however, they cannot be used in relational expressions.

FALSE

11) True/False: You may nest while and do-while loops, but you may not nest for loops.

FALSE

12) True/False: You may not use the break statement in a nested loop.

FALSE

26) This statement causes a loop to terminate early. A) stop B) break C) null D) terminate E) None of these

B

40) To read data from a file, you define an object of this data type. A) inputFile B) ifstream C) fstream D) ofstream

B

36) To allow file access in a program, you must #include this header file. A) file B) fileaccess C) fstream D) cfile

C

14) This means to increase a value by one. A) decrement B) increment C) modulus D) parse E) None of these

B

23) The do-while loop is considered a(n) ________ loop. A) pre-test B) post-test C) infinite D) limited E) None of these

B

3) True/False: A while loop is somewhat limited, because the counter can only be incremented by one each time through the loop.

FALSE

35) What will the following code display? int number = 6 int x = 0; x = --number; cout << x << endl; A) 6 B) 5 C) 7 D) 0

B

7) True/False: You may not use the break and continue statements within the same set of nested loops.

FALSE

11) The do-while loop is a(n) ________ loop that is ideal in situations where you always want the loop to iterate at least once. A) post-test B) pre-test C) infinite D) null-terminated E) None of these

A

3) This operator increments the value of its operand, then uses the value in context. A) prefix increment B) postfix increment C) prefix decrement D) postfix decrement E) None of these

A

45) How many times will the following loop display "Hello"? for (int i = 0; i < 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

A

20) This is a variable that is regularly incremented or decremented each time a loop iterates. A) constant B) counter C) control statement D) null terminator E) None of these

B

8) True/False: The condition that is tested by a while loop must be enclosed in parentheses and terminated with a semicolon.

FALSE

25) This is a pre-test loop that is ideal in situations where you do not want the loop to iterate if the condition is false from the beginning. A) do-while B) while C) for D) infinite E) None of these

B

29) What will the following loop display? int x = 0; while (x < 5) { cout << x << endl; x++; } A) 0 1 2 3 4 5 B) 0 1 2 3 4 C) 01 2 3 4 D) The loop will display numbers starting at 0, for infinity.

B

39) To write data to a file, you define an object of this data type. A) outputFile B) ifstream C) fstream D) ofstream

D

44) What will the following code display? int x = 0; for (int count = 0; count < 3; count++) x += count; cout << x << endl; A) 0 1 2 B) 0 C) 6 D) 3

D

4) The while loop has two important parts: an expression that is tested for a true or false value, and: A) a statement or block that is repeated as long as the expression is true B) a statement or block that is repeated only if the expression is false C) one line of code that is repeated once, if the expression is true D) a statement or block that is repeated once, if the expression is true

A

48) How many times will the following loop display "Hello"? for (int i = 20; i > 0; i--) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

A

7) The statements in the body of a while loop may never be executed, whereas the statements in the body of a do-while loop will be executed: A) at least once B) at least twice C) as many times as the user wishes D) never E) None of these

A

1) These are operators that add and subtract one from their operands. A) plus and minus B) ++ and -- C) binary and unary D) conditional and relational E) None of these

B

19) Something within a while loop must eventually cause the condition to become false, or a(n) ________ results. A) null value B) infinite loop C) unexpected exit D) compiler error E) None of these

B

2) What is the output of the following code segment? n = 1; while (n <= 5) cout << n << ' '; n++; A) 1 2 3 4 5 B) 1 1 1... and on forever C) 2 3 4 5 6 D) 1 2 3 4 E) 2 3 4 5

B

22) What is the output of the following code segment? n = 1; for ( ; n <= 5; ) cout << n << ' '; n++; A) 1 2 3 4 5 B) 1 1 1 ... and on forever C) 2 3 4 5 6 D) 1 2 3 4 E) 2 3 4 5

B

43) A file must be ________ before data can be written to or read from it. A) closed B) opened C) buffered D) initialized E) None of these

B

46) How many times will the following loop display "Hello"? for (int i = 1; i < 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

B

27) If you want a user to enter exactly 20 values, which loop would be the best to use? A) do-while B) for C) while D) infinite E) None of these

B

37) A file ________ is a small holding section of memory that file-bound information is first written to. A) name B) number C) buffer D) segment E) None of these

C

13) True/False: An output file is a file that data is written to.

TRUE

32) What will the following code display? int number = 6; cout << number++ << endl; A) 6 B) 5 C) 7 D) 0

A

33) What will the following code display? int number = 6; cout << ++number << endl; A) 6 B) 5 C) 7 D) 0

C

5) True/False: The scope of a variable declared in a for loop's initialization expression always extends beyond the body of the loop.

FALSE

24) This loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop. A) do-while B) while C) for D) infinite E) None of these

C

34) What will the following code display? int number = 6; int x = 0; x = number--; cout << x << endl; A) 6 B) 5 C) 7 D) 0

A

5) The while loop is this type of loop. A) post-test B) pre-test C) infinite D) limited E) None of these

B

15) When the increment operator precedes its operand, as in ++num1, the expression is in this mode. A) postfix B) prefix C) preliminary D) binary E) None of these

B

18) The while loop contains an expression that is tested for a true or false value, and a statement or block that is repeated as long as the expression: A) is false B) is true C) does not evaluate to true or false D) evaluates to true or false E) None of these

B

47) How many times will the following loop display "Hello"? for (int i = 0; i <= 20; i++) cout << "Hello!" << endl; A) 20 B) 19 C) 21 D) An infinite number of times

C

10) You may define a ________ in the initialization expression of a for loop. A) constant B) function C) variable D) new data type E) None of these

C

17) This is a control structure that causes a statement or group of statements to repeat. A) decision statement B) constant C) loop D) cout object E) None of these

C

30) What will the following code display? int number = 6; number++; cout << number << endl; A) 6 B) 5 C) 7 D) 0

C

31) What will the following code display? int number = 6; ++number; cout << number << endl; A) 6 B) 5 C) 7 D) 0

C

41) Assuming outFile is a file stream object and number is a variable, which statement writes the contents of number to the file associated with outFile? A) write(outFile, number); B) outFile >> number; C) outFile << number; D) number >> outFile;

C

42) Assuming dataFile is a file stream object, the statement: dataFile.close(); A) is illegal in C++ B) needs a filename argument to execute correctly C) closes a file D) is legal but risks losing valuable data E) None of these

C

6) If you place a semicolon after the test expression in a while loop, it is assumed to be a(n): A) pre-test loop B) post-test loop C) null statement D) infinite loop E) None of these

C

9) In a for statement, this expression is executed only once. A) test B) null C) initialization D) validation E) None of these

C

28) This statement may be used to stop a loop's current iteration and begin the next one. A) break B) terminate C) return D) continue E) None of these

D

10) True/False: Multiple relational expressions cannot be placed into the test condition of a for loop.

TRUE

15) True/False: In C++ 11 you can pass a string object as argument to a file stream object's open member function.

TRUE

16) True/False: string objects have a member function named c_str that returns the contents of the object formatted as a null-terminated C-string.

TRUE

2) True/False: A while loop's body can contain multiple statements, as long as they are enclosed in braces.

TRUE