Deck 6: Repeating Instructions

Question 1

In order to use the MessageBox.Show( )method,you need to not only add a reference to the namespace which includes the class,but also add a using directive to the program statements.

Answer 1

True

Question 2

s = num.Next(7);
The statement above produces seven random numbers.

Answer 2

False

Question 3

The sentinel value is used as the operand in the conditional expression for an indefinite loop.

Answer 3

True

Question 4

The while statement is the only type of loop construct that can be used to develop a sentinel-controlled loop.

Question 5

An advantage of sentinel-controlled loops is you do not need to know how many times the loop will be performed.

Question 6

The conditional expression is sometimes called the loop condition.

Question 7

int sum = 0;
int number = 1;
while (number < 100)
{
sum = sum + number;
}
The program statements above produce an infinite loop.

Question 8

An off-by-one error is a common problem associated with counter-controlled loops where the loop body is performed one too many or one too few times.

Question 9

Class diagrams show the data,method,and property members of a class.

Question 10

The do...while statement is a posttest loop,which means that the conditional expression is tested before any of the statements in the body of the loop are performed.

Question 11

Iteration is a technique used where a method calls itself repeatedly until it arrives at the solution.

Question 12

With while loops,if the conditional expression evaluates to true,the body of the loop is not performed;control transfers to the statements following the loop.

Question 13

Windows applications use an event-driven model to manage the interaction between the user and the GUI by handling the repetition for you.

Question 14

If a numeric variable is being changed by a consistent amount with each iteration through the loop,the while statement is the best choice of loop constructs.

Question 15

int sum = 0;
int number = 0;
while (number < 10)
{
sum = sum + number;
Console.WriteLine(sum);
}
The statement above prints the values of 0 through 9 on separate lines.

Question 16

Unlike the sentinel-controlled loop,the variable used with a state-controlled loop differs from the variable used to store the data that is being processed.

Question 17

You often need to do a "prime the read" for counter controlled loops which means that you would input a value before going into the body of the loop.

Question 18

To write a recursive solution,a base case needs to be identified.

Question 19

Using the break or continue statements with a loop violates the single entry and single exit guideline for developing a loop.

Question 20

A sentinel controlled loop is also called a flag-controlled loop.

Question 21

With the while loop,the body of the loop is ____.

A) always performed at least one time
B) performed as long as the conditional expression evaluates to true
C) must produce a boolean result
D) must be enclosed in curly braces

Question 22

A common problem associated with counter-controlled loops is not executing the loop for the last value.This type of problem is labeled a(n)____ error.

A) off-by-one
B) last-value
C) counter controlled
D) boundaries

Question 23

Without incrementing the counter used in the conditional expression with counter controlled loops,the loop would go on indefinitely.

Question 24

The do...while loop can be used to implement a counter-controlled,sentinel-controlled,or state-controlled loop.

Question 25

int counter = 0;
while (counter < 100)
{
Console.WriteLine(counter);
counter++;
}
Looking above,if the loop body was changed from counter++;to counter += 5;,how many times would the loop body be executed?

A) 19
B) 20
C) 99
D) 100

Question 26

In C# curly braces must be added to surround all loop bodies.

Question 27

C# performs automatic garbage collection once the loop is finished and releases any variables declared as part of the loop.

Question 28

One of the major strengths of programming languages can be attributed to loops.

Question 29

An interpretation of the while statement is "while the condition is true,perform statement(s)".

Question 30

What is NOT required when a counter-controlled loop is created?

A) Initializing loop control variable on the outside of the loop.
B) Incrementing the loop control variable inside the loop.
C) A conditional expression involving the loop control variable.
D) Allowing the user to enter a value indicating the loop should stop.

Question 31

In order to write a recursive solution ____.

A) the simplest case should be determined
B) you must create an infinite loop
C) write the iterative solution first
D) the most complicated approach must be identified

Question 32

With nested loops,the outermost loop is always totally completed before the innermost loop is executed.

Question 33

int counter = 0;
while (counter < 100)
{
Console.WriteLine(counter);
counter++;
}
The most appropriate sentinel value that might be selected for month of the year is ____.

A) 0
B) 1
C) 6
D) 12

Question 34

Scope refers to the region in the program in which you can use the variable.

Question 35

Which of the following is an advantage of a sentinel-controlled loop?

A) The number of iterations does not have to be known.
B) An extreme or dummy value can be entered.
C) The loop is always performed at least one time.
D) It could be used with the while form of the loop.

Question 36

int counter = 0;
while (counter < 100)
{
Console.WriteLine(counter);
counter++;
}
The last value printed with the above program segment is ____.

A) 0
B) 1
C) 99
D) 100

Question 37

A restriction on using the foreach statement is that you cannot change values in the collection.The access to the elements is read-only.

Question 38

A state-controlled loop should be designed when you know the number of times the statements must be executed.

Question 39

int counter = 0;
while (counter < 100)
{
Console.WriteLine(counter);
counter++;
}
The first value printed with the program segment above is ____.

A) 0
B) 1
C) 99
D) 100

Question 40

int counter = 0;
while (counter < 100)
{
Console.WriteLine(counter);
counter++;
}
A method that calls itself repeatedly until it arrives at the solution is a(n)____method.

A) static
B) recursive
C) iterative
D) instance

Question 41

A flag-controlled loop is also called a ____.

A) sentinel-controlled loop
B) counter-controlled loop
C) state-controlled loop
D) posttest form loop

Question 42

for (int outer = 0; outer < 2; outer++)
{
for (int inner = 0; inner < 3; inner++)
{
Console.WriteLine("Outer: {0}\tInner: {1}", outer, inner);
}
}
How many lines will be printed for the above nested loop?

A) 2
B) 3
C) 5
D) 6

Question 43

Instead of requiring that a dummy value be entered after all values are processed,a ____-controlled loop initializes a variable on the outside of the loop and then evaluates the variable to see when it changes values.Its value is changed inside the loop body when the loop should exit.

A) counter
B) sentinel
C) state
D) change

Question 44

What is a requirement of the sentinel-controlled loop shared by counter-controlled loops?

A) The conditional expression must be set up prior to the loop.
B) A counter must be initialized on the outside of the loop.
C) A counter must be incremented inside the loop body.
D) The expression must evaluate to false in order for the loop to be executed.

Question 45

The loop control structure used to move through a collection (group of data items)that does not require you to increment a loop control variable or test the expression to determine when all data has been processed is the ____ statement.

A) while
B) for
C) do...while
D) foreach

Question 46

int inner; for (int outer = 0;outer < 3;outer++)
{
For (inner = 1;inner < 2;inner++)
Console.WriteLine("Outer: {0}\tInner: {1}",outer,inner);
}
The nested for statement above displays how many lines of output?

A) 2
B) 3
C) 5
D) 6

Question 47

During the last iteration through the nested loop,what numbers are printed?

A) Outer: 1 Inner: 2
B) Outer: 2 Inner 3
C) Outer: 3 Inner 0
D) Outer: 1 Inner 0

Question 48

int loopVariable = 0;
do
{
Console.WriteLine("Count = {0:}", ++loopVariable);
}while (loopVariable < 5);
How many times will be loop body be executed?

A) 0
B) 4
C) 5
D) 6

Question 49

for (int i = 0; i < 5; i++)
Console.Write(i + "\t");
The conditional expression used with the for statement ____.

A) must involve a counter
B) must evaluate to false in order for the loop body to be executed
C) is evaluates after the loop body is performed once
D) is written following the first semicolon

Question 50

An example for statement that has a compound initialization,compound test and compound update could be written as ____.

A) for (int r = 0; c = 5; r < 3 && c > 2; r++; c--)
B) for (int r = 0; c = 5; r < 3 ; c > 2; r++; c--)
C) for (int r = 0, c = 5; r < 3, c > 2; r++, c--)
D) for (int r = 0, c = 5; r < 3 && c > 2; r++, c--)

Question 51

int loopVariable = 0;
do
{
Console.WriteLine("Count = {0:}", ++loopVariable);
}while (loopVariable < 5);
What will be printed during the first iteration through the loop?

A) 0
B) 1
C) 10
D) none of the above

Question 52

int loopVariable = 0;
do
{
Console.WriteLine("Count = {0:}", ++loopVariable);
}while (loopVariable < 5);
How many times will be loop body be executed if the conditional expression is changed to (loopVariable == 5)?

A) 0
B) 4
C) 5
D) 6

Question 53

for (int i = 0; i < 5; i++)
Console.Write(i + "\t");
Given the code snippet above,how many times will the loop body be executed?

A) 4
B) 5
C) 6
D) 10

Question 54

Which of the following is NOT a keyword used to enable unconditional transfer of control to a different program statement?

A) continue
B) break
C) goto
D) while

Question 55

In order to use the MessageBox.Show( )method in your console application,you must ____.

A) enclose the method call in a body of a loop
B) add a reference to the System.Windows.Forms.dll.
C) add a using System.MessageBox directive
D) call on the method from within the WriteLine( ) or Write( ) methods

Question 56

You must tell the user what value to type to end the loop for ____.

A) counter-controlled loops
B) state-controlled loops
C) sentinel-controlled loops
D) any type of loop

Question 57

The only posttest loop structure available in C# is _____.

A) while
B) for
C) do...while
D) foreach

Question 58

The event-driven model used to create Windows applications ____.

A) uses a counter-controlled form of loop
B) uses a state-controlled form of loop
C) uses a sentinel-controlled form of loop
D) handles the repetition for you

Question 59

for (int i = 0;i < 10;i++) {
Console.WriteLine("counter " + i);
}
The variable i defined in the program segment above ____.

A) is out of scope when the loop terminates
B) creates an error because it is changed in the update portion
C) would have a value of 10 if it were printed on the outside of the loop
D) can be displayed prior to the loop program statements

Question 60

To "prime the read" with a loop,you place an input statement ____.

A) inside the loop body
B) before the loop body
C) after the loop body
D) as part of the loop conditional expression

Question 61

When you know the number of times the statements must be executed,create a(n)____________ loop.

Question 62

The _____________ method of the MessageBox class displays a predefined dialog box that can contain text,captions for the title bar,special buttons,and icons.

Question 63

A(n)____________ is a loop that has no provisions for termination.

Question 64

An option other than looping that can be used to repeat program statement is _____________.With this technique a method calls itself repeatedly until it arrives at the solution.

Question 65

The third programming construct repetition is also called ____________.

Question 66

A sentinel value is a(n)____________.It is a value that should not be processed.

Question 67

The for statement is a compact method of writing the loops that can be written using while;it packages together the ____________,test,and update all on one line.

Question 68

The ____________ statement is a pretest form of loop which is considered a specialized form of the while statement and is usually associated with counter-controlled types of loops;

Question 69

if (int.TryParse(inStringValue,out integerValue)== false)
Console.WriteLine("Invalid input - 0 recorded for end value");
If a character such as "b" is entered by the user and stored in inStringValue,TryParse( )
returns ____________.

Question 70

____________ loops are often used for inputting data when you do not know the exact number of values to be entered.

Question 71

The ___________ loop structure,which restricts access to read-only,is used to iterate or move through a collection,such as an array.

Question 72

Inside the for statement,when you place a semicolon after the parentheses without anything to the left of it,it indicates that no statement or a(n)____________ statement is associated with the initialize portion.

Question 73

The only posttest loop structure available with C# is the ____________ loop structure.

Question 74

With counter controlled loops,it is important to think through and ____________ to ensure they have been taken into consideration.You should always check the initial and final values of the loop control variable and verify that you get the expected results at the boundaries.

Question 75

When one of the program statement included within the body of a loop is another loop,a(n)____________ loop is created.