Java switch Statement Quiz
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Questions and Answers

What is the purpose of the switch statement in Java?

  • To handle exceptions in Java programs
  • To provide a more efficient alternative to the if-else-if control structure
  • To handle ranges of values in a variable
  • To test for multiple cases when a variable is being checked for an exact match (correct)

In Java, when should the switch control structure be used?

  • When handling exceptions in a program
  • When a variable is to be tested against multiple cases with specific values (correct)
  • When checking for ranges of values in a variable
  • When testing for multiple, specific conditions with the if-else-if control structure

What does the default clause in a switch statement do?

  • It terminates the switch statement
  • It executes if there are no other case clauses
  • It handles exceptions thrown by the switch statement
  • It provides a catch-all option if none of the case clauses match (correct)

What types of variables can be used in a switch statement in Java?

<p>int or char (A)</p> Signup and view all the answers

In Java 7, what new feature was introduced for the switch statement?

<p>Ability to use String in switch statement (B)</p> Signup and view all the answers

How does the switch statement compare to the if-else-if control structure in terms of testing multiple conditions?

<p>The switch statement is more efficient when testing for multiple specific conditions (B)</p> Signup and view all the answers

What is the purpose of the break statement in a switch statement?

<p>It is used to terminate the switch statement and exit the switch block. (D)</p> Signup and view all the answers

What happens if the break statement is not included after a case in a switch statement?

<p>Execution will continue to the next case even if a match is found. (D)</p> Signup and view all the answers

When is the default case in a switch statement executed?

<p>When none of the case constants match the switch variable. (A)</p> Signup and view all the answers

What should be done if there is no default case specified in a switch statement?

<p>Execution will continue until either a break is encountered or the end of the switch statement is reached. (B)</p> Signup and view all the answers

What does the default case in a switch statement represent?

<p>Situations where none of the conditions are met. (D)</p> Signup and view all the answers

What is the purpose of the default case in a switch statement?

<p>To provide a backup option when none of the case constants match the switch variable. (A)</p> Signup and view all the answers

What happens if there is no break statement after a matched case in a switch statement?

<p>Execution will continue to the next case even if a match is found. (A)</p> Signup and view all the answers

'grade' in the given code 'char grade;' corresponds to which data type?

<p>'char' (D)</p> Signup and view all the answers

'keyboardIn.next().charAt(0)' in the given code represents:

<p>Inputting a character from the keyboard (C)</p> Signup and view all the answers

What happens if there is no match for 'b' in the given code 'switch(grade)'?

<p>&quot;Invalid grade entered&quot; would be displayed (C)</p> Signup and view all the answers

In the given context, what is the purpose of the variable 'counter'?

<p>To control the number of repetitions (C)</p> Signup and view all the answers

What is the role of the 'total' variable in this scenario?

<p>To accumulate the sum of grades (C)</p> Signup and view all the answers

What is the purpose of the 'average' variable in this context?

<p>To hold the average mark for the test (B)</p> Signup and view all the answers

What does the 'counter controlled repetition' method rely on to determine when to terminate the loop?

<p>The value of the 'counter' variable (C)</p> Signup and view all the answers

What is the purpose of the pseudocode mentioned in the context?

<p>To outline a step-by-step plan for calculating average grades (C)</p> Signup and view all the answers

What type of loop is typically used for counter controlled repetition, as mentioned in the context?

<p>'for' loop (D)</p> Signup and view all the answers

Study Notes

Switch Statement in Java

  • The switch statement is used to select one of many alternatives based on the value of a variable or expression.

When to Use Switch Statement

  • The switch control structure should be used when there are multiple alternatives based on a single value or expression.

Default Clause in Switch Statement

  • The default clause is used to specify a block of code to execute when none of the case values match the expression.
  • The default clause is optional.

Variables in Switch Statement

  • The switch statement can be used with byte, short, char, and int primitive data types.
  • As of Java 7, the switch statement can also be used with strings.

Break Statement in Switch Statement

  • The break statement is used to exit the switch statement and continue executing the code after the switch block.
  • If the break statement is not included after a case, the code will continue to execute the next case statements.

Default Case Execution

  • The default case is executed when none of the case values match the expression.

Importance of Default Case

  • If there is no default case specified, the program will not handle unexpected values.
  • The default case represents the default action to take when none of the case values match.

Purpose of Default Case

  • The purpose of the default case is to provide a default action to take when none of the case values match.

Counter Controlled Repetition

  • The 'counter' variable is used to keep track of the number of iterations in a loop.
  • The 'total' variable is used to accumulate a total value in a loop.
  • The 'average' variable is used to calculate the average value in a loop.
  • The counter controlled repetition method relies on a variable to determine when to terminate the loop.
  • A for loop is typically used for counter controlled repetition.

Pseudocode

  • Pseudocode is a high-level representation of a programming algorithm.
  • The purpose of pseudocode is to describe an algorithm in a simple and understandable format.

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Related Documents

Week 3 Switches.pdf

Description

Test your knowledge of the switch statement in Java with this quiz. Learn about using the switch control structure to test a variable against multiple cases and its advantages over the if-else-if statement.

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