Control Structures in Programming

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Questions and Answers

What is the primary function of the if selection statement?

It selects or ignores a single action based on a condition. (correct)

It selects between multiple actions depending on conditions.

It executes a series of commands sequentially.

It repeats a set of actions until a condition is met.

Which statement correctly describes the if…else selection structure?

It allows for the execution of one action if a condition is true, and another if it is false. (correct)

It evaluates multiple conditions simultaneously.

It runs indefinitely until a condition is met.

It is designed to execute a group of actions without conditions.

What distinguishes a switch selection statement from the if selection statement?

A switch statement handles a single condition with multiple outcomes. (correct)

A switch statement repeats actions until a condition is false.

A switch statement can only choose between two specific actions.

A switch statement provides a sequential execution of commands.

In which scenario would a nested if-else structure be most appropriate?

When one condition leads to further sub-conditions that need to be evaluated. (A) Signup and view all the answers

What is the fundamental purpose of repetition control structures in programming?

To repeat a set of actions until a specified condition is met. (B) Signup and view all the answers

Which of the following is an example of a repetition control structure?

for loop (A) Signup and view all the answers

What will be printed if a student's grade is 55 in an if-else selection structure that specifies grades below 60 as 'failed'?

Failed (C) Signup and view all the answers

In a nested if-else structure, what will be printed if the grade is 72?

A (D) Signup and view all the answers

Which repetition structure tests its condition at the beginning of each loop?

While loop (A) Signup and view all the answers

What is indicated by an else if statement in a nested if-else structure?

It allows for multiple conditions to be evaluated. (C) Signup and view all the answers

What will happen if the condition in a while loop is false from the start?

The sequence of activities won't run at all. (D) Signup and view all the answers

Which of the following statements is true regarding the if-else selection structure?

It executes the first true condition found and ignores the rest. (D) Signup and view all the answers

In a nested if-else structure, which output would result from a grade of 45?

D (D) Signup and view all the answers

Which repetition control structure guarantees that the sequence of activities runs at least once?

Do-while loop (D) Signup and view all the answers

What happens if the condition of a while loop starts out false?

The statement is never executed. (D) Signup and view all the answers

In a do-while loop, when is the condition tested?

After executing the statements. (B) Signup and view all the answers

Which is a primary difference between a while loop and a do-while loop?

A do-while loop executes at least once. (B) Signup and view all the answers

What is the initial value of 'count' in the pseudocode designed to print 'I love computers' five times?

0 (A) Signup and view all the answers

What will happen if the condition in a while loop is never met during its execution?

The loop will not execute at all. (A) Signup and view all the answers

In the context of repetition control structures, which loop will always execute at least once before the condition is evaluated?

Do-while loop (B) Signup and view all the answers

What does 'increment count' in the while loop pseudocode achieve?

It increases the count to avoid infinite loops. (C) Signup and view all the answers

In a flowchart representing a while loop, what happens when the condition evaluates to true?

The statement is executed and the condition is re-evaluated. (C) Signup and view all the answers

Study Notes

If…Else Selection Structure

Allows for different actions based on a condition being true or false.
Example: If a student's grade is >= 60, print "Passed"; otherwise, print "Failed".

Nested If…Else Statement

Used for multiple condition checks within selection structures.
Example structure:
- If (grade >= 70) → Print "A"
- Else if (grade >= 60) → Print "B"
- Else if (grade >= 50) → Print "C"
- Else if (grade >= 40) → Print "D"
- Else → Print "F"

Repetition Control Structures

Enables repeated execution of code segments.
Common repetition statements: while, do…while, for.

While Loop

A loop that executes while a specified condition remains true.
Condition is checked at the start; if false from the outset, the loop does not execute.
Structure:
- while (condition) { statement(s); }

Flowcharts

Visual representation of program flow and logic.
Enables clear understanding of control structures like loops and conditionals.

Types of Control Structures

Sequence Structure: Default execution in order.
Selection Structures:
- if, if-else, switch statements.
Repetition Structures:
- while, do/while, for loops.

Selection Control Structures

Includes if selection statement (single action), if…else statement (double action), and switch statement (multiple actions).

Flowchart for If Statement

Visualizes decision-making processes in programs:
- True branch executes one set of statements.
- False branch executes another or stops.

Flowchart for While Loop

Illustrates the loop condition:
- If condition is true, execute statements; if false, exit the loop.

Do…While Control Structure

Similar to while, but checks its condition after executing statements.
Guarantees at least one execution.
Syntax:
- do { statement(s); } while (condition);

Control Flow in Do…While Loop

Control returns to the loop's start if the condition remains true.
Loop exits when the condition evaluates to false.

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Description

This quiz covers key concepts in programming control structures, including If...Else statements, nested structures, and repetition controls like loops. Additionally, it explores the use of flowcharts for visualizing program logic. Test your knowledge and understanding of these fundamental programming concepts!