Java Selection Structures Quiz
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Questions and Answers

What is the purpose of the 'if-else' structure in programming?

  • To select between two alternatives based on a condition (correct)
  • To perform a specific action without any condition
  • To handle exceptions in the code
  • To repeat a block of code while a condition is true

In the 'if-else if-else' structure, when does the program execute the 'else' block?

  • When the condition in the 'else if' block is false (correct)
  • When the condition in the 'if' block is true
  • When the condition in the 'if' block is false
  • When the condition in the 'else if' block is true

What is the output of Sample Program 1 if the input number is 0?

  • An error will occur
  • 0 is a negative value (correct)
  • 0 is a positive value
  • Number entered is zero

In which scenario does Alternative Program 2 execute the 'else if (number < 0)' block?

<p>When the number is less than 0 (D)</p> Signup and view all the answers

What does the 'if/else ladder' refer to in programming?

<p>Nested if-else statements (D)</p> Signup and view all the answers

What is the purpose of the 'Selection' control structure in programming?

<p>To choose between different paths based on a condition (C)</p> Signup and view all the answers

What happens if none of the conditional expressions in a chain of if-else statements are true?

<p>The final else statement is executed as the default condition (A)</p> Signup and view all the answers

In the given code, what is the value of 'grade' if 'mark' is 75?

<p>A (B)</p> Signup and view all the answers

What is the purpose of using logical operators in conditional statements?

<p>To allow more than one criteria in a conditional statement (C)</p> Signup and view all the answers

In the alternative comparison code, what is the value of 'grade' if 'mark' is 55?

<p>C (A)</p> Signup and view all the answers

What does the 'else' statement represent in a chain of if-else statements?

<p>It handles any conditions that were missed by the preceding if and else-if statements (C)</p> Signup and view all the answers

What happens if a true condition is found in a chain of if-else statements?

<p>The statement associated with it is executed and the rest of the ladder is bypassed (C)</p> Signup and view all the answers

When are logical operators used in conditional statements?

<p>To allow more than one criteria in a conditional statement (A)</p> Signup and view all the answers

What does the final else act as in a chain of if-else statements?

<p>'Default' condition handler (C)</p> Signup and view all the answers

What are the outcomes of using && as a logical operator?

<p>Return true if both conditions A and B are true (C)</p> Signup and view all the answers

What happens if there is no final else and all other conditions are false in a chain of if-else statements?

<p>No action will take place (D)</p> Signup and view all the answers

Flashcards

if-else structure

A control structure that allows branching in program flow based on a condition.

else block

Executes only if all preceding if and else if conditions are false.

else if condition

Adds another condition to check if a number is less than 0.

if/else ladder

A series of if/else if statements for multiple conditions.

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Selection structure

A structure that controls the program flow based on conditions.

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No true conditions

If no conditions are true, the final else (or nothing) executes.

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grade for mark=75

Grade is determined by conditions within the program.

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Logical operators

Operators that combine conditions in if statements.

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grade for mark=55

Grade depends on defined conditions for a lower grade.

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else statement

A catch-all statement when no other condition is true.

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True condition

A condition that, when met, executes the corresponding block.

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Conditional Statements

Statements used to perform different actions depending on whether a condition is met.

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&& operator

Logical AND operator that evaluates to true only if both conditions are true.

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Absence of else

If no else exists and all conditions are false, the program continues without executing conditional blocks.

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Logical operator use

Logical operators expand decision-making capabilities by testing multiple conditions in a single statement.

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Final Else

The final else in an if/else structure acts as a fallback, handling all cases not covered by previous conditions.

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Condition evaluation

Process of testing a condition to determine if it is true or false within an if-else/if-else if construct.

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Output upon specific input

The output of a program depends on the conditions evaluated. The program's output is based on the 'if/else if/else' hierarchy.

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Execution order

The order of instructions execution in an if /else /else if statement is critical. It starts with the first if, then 'else if', and uses the 'else' as the default condition.

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Program flow

The order in which parts of a computer program are executed.

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Study Notes

Purpose of 'if-else' Structure

  • Allows branching in program flow based on condition evaluation.
  • Facilitates decision-making in code execution paths.

Execution of 'else' Block

  • The 'else' block executes when all preceding 'if' and 'else if' conditions evaluate as false.

Output of Sample Program 1

  • If input is 0, the output is determined by conditions specific to that program structure, often leading to a default behavior or message.

Condition for 'else if (number < 0)'

  • The 'else if (number < 0)' block executes when the number is negative.

'if/else Ladder'

  • Refers to a series of 'if' and 'else if' statements leading to a final 'else', used for multiple conditional checks.

Purpose of 'Selection' Control Structure

  • Manages the flow of program execution based on various conditions, enabling selective code execution.

No True Conditions in if-else Statements

  • If none of the conditions are true, any final 'else' will execute, or if absent, the program proceeds without executing conditional blocks.

Value of 'grade' for 'mark' = 75

  • The value of 'grade' would be determined based on specific conditions defined in the code; typically indicative of a passing mark.

Purpose of Logical Operators

  • Enhance conditional statements by allowing multiple conditions to be evaluated simultaneously.
  • Commonly used in conjunction with 'if' statements for complex condition definition.

Value of 'grade' if 'mark' = 55

  • The value of 'grade' is determined by conditions set in the alternative comparison code; typically reflects a lower pass or fail status.

Representation of 'else' Statement

  • Serves as a catch-all for any remaining conditions not satisfied by prior 'if' or 'else if' statements.

True Condition in if-else Chain

  • When a true condition is found, the corresponding block executes, and subsequent conditions are skipped.

Use of Logical Operators in Conditional Statements

  • Employed to check multiple conditions at the same time, significantly expanding decision-making capabilities.

Final Else in if-else Statements

  • Acts as a fallback option, executing when all preceding conditions are false.

Outcomes of && as Logical Operator

  • Evaluates to true only if both conditions are true, allowing precise control over decision-making.

Absence of Final Else

  • If no final 'else' exists and all conditions are false, the program does nothing or moves to the next block of code outside the 'if-else' structure.

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Description

Test your knowledge of Java selection structures with this quiz. The quiz covers if-else, if-else if-else, and switch control structures, along with sample programs to reinforce learning.

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