Test Bank Docx Loops And Files Ch.5 Gaddis

Starting Out with C++ from Control Structures to Objects, 9e (Gaddis)

Chapter 5 Loops and Files

TRUE/FALSE

1. The increment and decrement operators can be used in mathematical expressions; however, they cannot be used in relational expressions.

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

3. A while loop is somewhat limited because the counter can only be incremented by one each time through the loop.

4. An initialization expression may be omitted from the for loop if no initialization is required.

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

6. If you want to stop a loop before it goes through all of its iterations, the break statement may be used.

7. You may not use both break and continue statements within the same set of nested loops.

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

9. The update expression of a for loop can contain more than one statement, for example:

for(i = 5; i <= 10; i++, total+= sales)

10. Multiple relational expressions cannot be placed into the test condition of a for loop.

11. You may nest while and do-while loops but you may not nest for loops.

12. You may not use the break statement in a nested loop.

13. An output file is a file that data is written to.

14. It is possible to define a file stream object and open a file in one statement.

15. In C++ 11 you can pass a string object as an argument to a file stream object's open member function.

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

MULTIPLE CHOICE

1. These are operators that add and subtract one from their operands.

2. This operator increments the value of its operand and then uses the value in context.

3. This is a control structure that causes a statement or group of statements to repeat.

4. The two important parts of a while loop are the expression that is tested for a true or false value and

5. Something within a while loop must eventually cause the condition to become false or a(n) __________ results.

6. The while loop is a __________ loop.

7. If you place a semicolon after the test expression in a while loop, it is assumed to be a(n)

8. The statements in the body of a while loop may never be executed while the statements in the body of a do-while loop will be executed

9. When the increment operator precedes its operand, as ++num, the expression is in __________ mode.

10. This means to increase a value:

11. A statement that may be used to stop a loop's current iteration and begin the next one is

12. A statement that causes a loop to terminate early is

13. A variable that is regularly incremented or decremented each time a loop iterates is a

14. A special value that marks the end of a list of values is a

15. What is the output of the following code segment?

n = 1;

while (n <= 5)

cout << n << ' ';

n++;

16. In the following statement, which operator is used first?

while (x++ < 10)

17. What will the following code display?

int number = 6;

number++;

cout << number << endl;

18. What will the following code display?

int number = 6;

++number;

cout << number << endl;

19. What will the following code display?

int number = 6;

cout << number++ << endl;

20. What will the following code display?

int number = 6;

cout << ++number << endl;

21. What will the following code display?

int number = 6;

int x = 0;

x = number--;

cout << x << endl;

22. What will the following code display?

int number = 6;

int x = 0;

x = --number;

cout << x << endl;

23. A for statement contains three expressions: initialization, test, and

24. In a for statement, this expression is executed only once:

25. You may define a __________ in the initialization expression of a for loop.

26. The do-while loop is considered

27. The __________ loop is ideal in situations where you want the loop to iterate at least once.

28. The __________ loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop.

29. The __________ loop is a good choice when you do not want the loop to iterate if the condition is false in the beginning.

30. If you want a user to enter exactly 20 values, which loop would be the best to use?

31. What will the following code display?

int x = 0;

while (x < 5)

{

cout << x << " ";

x++;

}

32. What will the following code display?

int x = 0;

for (int count = 0; count < 3; count++)

x += count;

cout << x << endl;

33. How many times will the following loop display "Hello world!"?

for (int i = 0; i < 20; i++)

cout << "Hello world!" << endl;

34. How many times will the following loop display "Looping again!"?

for (int i = 0; i <= 20; i++)

cout << "Looping again!" << endl;

35. How many times will the following loop display "Looping!"?

for (int i = 20; i > 0; i--)

cout << "Looping!" << endl;

36. A loop that is inside another loop is called a(n)

37. A file must be __________ before data can be written to or read from it.

38. A file __________ is a small holding section of memory that file-bound information is first written to.

39. To write information to a file, use the

40. To allow file access in a program, you must use __________ in the header file.

41. To write data to a file, you define an object of the __________ data type.

42. To write read data from a file, you define an object of the __________ data type.

43. 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?

44. Assuming dataFile is a file stream object, the following statement:

dataFile.close();