Question 1

Why is it important to initialize an accumulator variable?

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Question 2

Often, totals are ____; that is, summed one at a time in a loop.
A) decremented
B) incremented
C) derived
D) accumulated

Accepted Answer

The word "summed" indicates that values are added together, which is commonly referred to as accumulating a total. Therefore, option D, "accumulated," is the best choice.

Question 3

The expressions in each part of an AND or OR expression use ____ evaluation; that is, they are evaluated only as much as necessary to determine whether the entire expression is true or false .
A) while
B) stopwatch
C) short-circuit
D) loop

Accepted Answer

The term "short-circuit" evaluation is used to describe the behavior of AND and OR expressions. In short-circuit evaluation, the expressions are evaluated only as much as necessary to determine whether the entire expression is true or false. This means that if the result of an AND expression can be determined by checking just the first expression (which is false), the second expression is never evaluated. Similarly, if the result of an OR expression can be determined by checking just the first expression (which is true), the second expression is never evaluated. This behavior can be useful for improving performance and avoiding potential errors.

Question 4

Loop ____ is the technique of combining two loops into one.
A) pretesting
B) short-circuiting
C) accumulation
D) fusion

Accepted Answer

Loop fusion is the technique of combining two loops into one. This can improve performance by reducing the number of loop iterations and improving cache efficiency. Pretesting involves checking a loop condition before entering the loop. Short-circuiting involves stopping the evaluation of a boolean expression if the result is already determined. Accumulation involves accumulating a value over multiple iterations of a loop.

Question 5

You can use a(n) ____________________ loop to execute a body of statements continuously as long as some condition continues to be true .

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Question 6

Event-driven GUI programs sometimes require fewer coded loops than their counterpart console applications because some events are determined by the ____ when the program is running.
A) user's actions
B) loop performance
C) GUI's properties
D) loop nesting

Accepted Answer

Event-driven GUI programs respond to user actions (such as clicking a button or typing in a text field) and do not require constant loops to check for input. Instead, they wait for events to occur and then respond accordingly. Therefore, the user's actions determine the events that occur and the program responds accordingly.

Question 7

A value that a user must supply to stop a loop (for example, 'Y' or 'N' ) is called a(n) ____________________ value.

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Question 8

Statements in a while loop or for loop body can be blocked. Write a for loop that displays "Hello" and "Goodbye" four times each using a blocked loop body.

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Question 9

When a variable is declared inside a loop, it can be referenced only for the duration of the loop body. Once the loop finishes execution, the variable is out of ____________________, which means it is not usable because it has ceased to exist.

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Question 10

When you use a loop within a loop, you should always think of the ____ loop as the all-encompassing loop.
A) inner
B) outer
C) while
D) for

Accepted Answer

When you use a loop within a loop, the outer loop is the one that controls the inner loop(s). Therefore, you should always think of the outer loop as the all-encompassing loop.

Question 11

A(n) ____________________ is a structure that allows repeated execution of a block of statements.

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Question 12

When writing a while loop, how can you ensure that it will end correctly?

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Question 13

Suppose a loop should execute while x is less than the sum of two integers, a and b . The loop could be written as: 
while (x 
// loop body 
Although this code fragment will run, it is not particularly efficient. In what way is it inefficient, and how could you improve the loop's performance?

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Question 14

Write two code segments that print the integers 1 through 10. One segment should use a while loop and the other should use a for loop.

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Question 15

Because you need definite loops so frequently when you write programs, C# provides a shorthand way to create such a loop. This shorthand structure is called a(n) ____________________ loop.

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Question 16

What tasks can be performed in the three sections of a for loop in addition to initializing a single variable, testing the variable, and incrementing it?

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Question 17

Briefly describe the structure of a for loop.

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Question 18

An accumulator variable must be set to ____ before it is used to accumulate a total.
A) 1
B) false
C) true
D) 0

Accepted Answer

Before accumulating any values, the accumulator variable should be initialized to 0. This way, the accumulator will start from 0, and the accumulated values will be added to it.

Question 19

Write a short program that prints "Hello" on the console four times using a while loop.

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Question 20

What are three common ways that the value of a loop control variable is changed during the loop's execution?

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Quiz 5: Looping

Why is it important to initialize an accumulator variable?

Often, totals are ____; that is, summed one at a time in a loop.

The expressions in each part of an AND or OR expression use ____ evaluation; that is, they are evaluated only as much as necessary to determine whether the entire expression is true or false .

Loop ____ is the technique of combining two loops into one.