Programming Structures: Loops

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Questions and Answers

Which programming structure involves performing an action depending on a specific condition?

Selection (correct)
Repetition
Iteration
Sequence

A `WHILE` loop is a trailing decision loop, meaning the condition is checked after the loop body is executed.

False (B)

In a `WHILE` loop, what term is used to describe each execution of the statements within the loop's body?

iteration

The `______` loop is guaranteed to execute its body at least once.

do-while

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Match the loop type with its appropriate characteristic:

<code>WHILE</code> loop = Condition is checked before loop execution <code>DO-WHILE</code> loop = Condition is checked after loop execution <code>FOR</code> loop = Often used for a specific number of iterations

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Which of the following is a characteristic of repetition (loops) in programming?

Performs an action until a specific condition is met. (C)

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The 'selection' programming structure involves completing a series of actions in a specific order.

False (B)

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What type of programming structure repeatedly performs an action until a certain condition is met?

repetition or loop

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A `______` loop is considered a leading decision loop.

while

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Match the loop type with its description:

<code>WHILE</code> loop = Repeats as long as the condition is true. <code>DO-WHILE</code> loop = Guarantees at least one execution of the loop body. <code>FOR</code> loop = Typically used for iterating a specific number of times.

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Which loop continues its iterations as long as a specified condition remains true?

<code>WHILE</code> (C)

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A `DO-WHILE` loop is guaranteed to execute at least once, regardless of the initial condition.

True (A)

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What are the three types of loops?

<code>while</code> loop, <code>do-while</code> loop, <code>for</code> loop

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The main difference between a `WHILE` and a `DO-WHILE` loop is that the `______` loop always executes at least once.

do-while

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Match the following loop structures with their characteristics:

<code>WHILE</code> loop = Condition is checked at the beginning of the loop. <code>DO-WHILE</code> loop = Condition is checked at the end of the loop. <code>FOR</code> loop = Consists of initialization, condition, and increment/decrement statements.

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What is the purpose of a sentinel value in a loop?

To indicate the end of input or processing. (C)

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In DOWHILE loop and REPEAT UNTIL loop, the statements are executed first, then the condition is evaluated.

True (A)

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What programming structure do nested loops consist of?

outer loop and one or more inner loops

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In a `FOR` loop, the three actions performed are initialization, evaluate/check, and `______`.

increment/decrement

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Match the following loop constructs with their primary characteristics:

<code>FOR</code> loop = Ideal for repeating a block of code a known number of times. <code>WHILE</code> loop = Repeats a block of code as long as a condition is true. <code>Sentinel</code> loop = The end point of input data is not known

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Which of the following loops is guaranteed to execute at least once?

Do-While loop (B)

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Nested loops are formed by placing a conditional 'if' statement within a loop.

False (B)

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What term describes a loop that continues indefinitely due to a condition that never becomes false?

infinite loop

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A predetermined value used to stop a program from receiving an input is referred to as a ______ .

sentinel

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Match each type of loop with its control statement:

For loop = Initialization, condition, increment While loop = Conditional expression Do-While loop = Conditional expression (evaluated after the loop body)

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What is a primary advantage of using loops in programming?

To efficiently perform repetitive tasks. (B)

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In a `FOR` loop, if the condition is initially false, the loop will still execute once.

False (B)

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What is the key difference between DOWHILE and DO-WHILE loops?

space or dash

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The `______` loop is a count loop, similar to the `FOR` loop.

do

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Match statements to when the condition is tested:

WHILE loop = Test condition before each loop iteration DO-WHILE loop = Test condition after each loop iteration infinite loop = Condition is always skipped so continues forever

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Flashcards

Repetition (Loops)

A programming structure that repeatedly executes a block of code until a certain condition is met.

WHILE Loop

A loop that executes a block of code as long as a specified condition is true.

DOWHILE Loop

A loop similar to a WHILE loop, but with a different syntax variation.

DO-WHILE Loop

A loop that executes a block of code at least once, and then continues as long as a specified condition is true.

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FOR Loop

A loop is used for executing a block of code a specific number of times.

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DO loop

A ‘counted loop’, executes code a set number of times.

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Nested Loops

A loop placed inside another loop.

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Iteration

A single pass through a loop's body.

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Infinite Loop

A WHILE loop where the condition to exit is never met, resulting in the loop executing indefinitely.

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DO-WHILE vs. REPEAT-UNTIL

DO-WHILE loops continue until a condition is false, while REPEAT-UNTIL loops continue until a condition is true.

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Sentinel Value

A special value used to indicate the end of data input. The loop terminates when this value is entered.

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Actions in a FOR loop

Three actions that are performed in a for loop including initialization, evaluation/check and Increment/Decrement

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Study Notes

There are three programming structures: sequence, selection, and repetition.
A sequence is a series of actions completed in a specific order.
Selection performs an action depending on a specific condition.
Repetition (loops) repeatedly performs an action until a certain condition is met.
Combined programming structures can produce a complex system.
Repetition allows programmers to write code that repeats a task until something happens.
Programmers can efficiently code repetitive tasks, instead of rewriting the same actions.

Types of Loops

WHILE loop: leading decision loop
DOWHILE loop: similar to WHILE loop
DO-WHILE: trailing decision loop
REPEAT UNTIL: similar to DO-WHILE
FOR loop: leading decision loop
DO Loop: counted loop, similar to the FOR loop

WHILE Loop

The statements in the body of a WHILE loop will execute as long as the condition is true.
Each execution of a loop is called an iteration.

WHILE vs DOWHILE Loop

The WHILE loop and DOWHILE loop are the same, with no space or dash in between.
The DO-WHILE loop is not the same as DOWHILE loop.
The DO-WHILE loop will always execute at least once, regardless of the condition.
In a WHILE loop, the condition is checked first, then statements are executed, and in a DO-WHILE loop, the statements are executed first, then the condition is checked.

DO-WHILE and REPEAT UNTIL Loops

DO-WHILE and REPEAT UNTIL loops are similar.
The statements are executed first, and then the condition is evaluated.

FOR Loop

FOR loops perform three actions: initialize, evaluate/check, and increment/decrement.

FOR Loop vs DO Loop

FOR loops and DO loops are similar.
DO loop will automatically increment the counter.

Sentinel

A sentinel can be used to tell the program to stop receiving an input.
A sentinel is a predetermined value used to stop a program.
Sentinels can be a key like ESC or any dummy value that could be used to end a program.
Sometimes the term EOF (End of File) is used as a sentinel.
The end point of the input data is not always known.

Nested Loops

Nested loops consist of an outer loop and one or more inner loops.
A nested loop consists of a loop within a loop.

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Podcast

Questions and Answers

Which programming structure involves performing an action depending on a specific condition?

A WHILE loop is a trailing decision loop, meaning the condition is checked after the loop body is executed.

In a WHILE loop, what term is used to describe each execution of the statements within the loop's body?

The ______ loop is guaranteed to execute its body at least once.

Match the loop type with its appropriate characteristic:

Which of the following is a characteristic of repetition (loops) in programming?

The 'selection' programming structure involves completing a series of actions in a specific order.

What type of programming structure repeatedly performs an action until a certain condition is met?

A ______ loop is considered a leading decision loop.

Match the loop type with its description:

Which loop continues its iterations as long as a specified condition remains true?

A DO-WHILE loop is guaranteed to execute at least once, regardless of the initial condition.

What are the three types of loops?

The main difference between a WHILE and a DO-WHILE loop is that the ______ loop always executes at least once.

Match the following loop structures with their characteristics:

What is the purpose of a sentinel value in a loop?

In DOWHILE loop and REPEAT UNTIL loop, the statements are executed first, then the condition is evaluated.

What programming structure do nested loops consist of?

In a FOR loop, the three actions performed are initialization, evaluate/check, and ______.

Match the following loop constructs with their primary characteristics:

Which of the following loops is guaranteed to execute at least once?

Nested loops are formed by placing a conditional 'if' statement within a loop.

What term describes a loop that continues indefinitely due to a condition that never becomes false?

A predetermined value used to stop a program from receiving an input is referred to as a ______ .

Match each type of loop with its control statement:

What is a primary advantage of using loops in programming?

In a FOR loop, if the condition is initially false, the loop will still execute once.

What is the key difference between DOWHILE and DO-WHILE loops?

The ______ loop is a count loop, similar to the FOR loop.

Match statements to when the condition is tested:

Flashcards

Repetition (Loops)

WHILE Loop

DOWHILE Loop

DO-WHILE Loop

FOR Loop

DO loop

Nested Loops

Iteration

Infinite Loop

DO-WHILE vs. REPEAT-UNTIL

Sentinel Value

Actions in a FOR loop

Study Notes

Types of Loops

WHILE Loop

WHILE vs DOWHILE Loop

DO-WHILE and REPEAT UNTIL Loops

FOR Loop

FOR Loop vs DO Loop

Sentinel

Nested Loops

Studying That Suits You

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A `WHILE` loop is a trailing decision loop, meaning the condition is checked after the loop body is executed.

In a `WHILE` loop, what term is used to describe each execution of the statements within the loop's body?

The `______` loop is guaranteed to execute its body at least once.

A `______` loop is considered a leading decision loop.

A `DO-WHILE` loop is guaranteed to execute at least once, regardless of the initial condition.

The main difference between a `WHILE` and a `DO-WHILE` loop is that the `______` loop always executes at least once.

In a `FOR` loop, the three actions performed are initialization, evaluate/check, and `______`.

In a `FOR` loop, if the condition is initially false, the loop will still execute once.

The `______` loop is a count loop, similar to the `FOR` loop.