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?

When the number is less than 0 Signup and view all the answers

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

Nested if-else statements Signup and view all the answers

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

To choose between different paths based on a condition Signup and view all the answers

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

The final else statement is executed as the default condition Signup and view all the answers

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

A Signup and view all the answers

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

To allow more than one criteria in a conditional statement Signup and view all the answers

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

C Signup and view all the answers

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

It handles any conditions that were missed by the preceding if and else-if statements Signup and view all the answers

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

The statement associated with it is executed and the rest of the ladder is bypassed Signup and view all the answers

When are logical operators used in conditional statements?

To allow more than one criteria in a conditional statement Signup and view all the answers

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

'Default' condition handler Signup and view all the answers

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

Return true if both conditions A and B are true 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?

No action will take place Signup and view all the answers

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.