8 Lecture

1. What is a switch statement? A) A type of conditional statement B) A type of loop statement C) A type of function definition D) A type of data type

Answer: A

2. What is the purpose of a switch statement? A) To compare two variables B) To execute different code blocks based on a match C) To loop through a series of values D) To define a function

Answer: B

3. Which keyword is used to define a switch statement in Java? A) for B) while C) switch D) do

Answer: C

4. Which of the following is true about switch statements? A) It can have multiple default cases B) It can only have one case C) It can only have one default case D) It cannot have a default case

Answer: C

5. What happens if no case matches in a switch statement? A) The program crashes B) The default case is executed C) The program skips the switch statement D) An error is thrown

Answer: B

6. Which of the following data types can be used in a switch statement in C++? A) char B) float C) double D) bool

Answer: A

7. Can a switch statement be used with strings in Java? A) Yes B) No

Answer: A

8. Which keyword is used to exit a switch statement in Java? A) break B) continue C) exit D) return

Answer: A

9. Which of the following is an advantage of using switch statements? A) It makes the code more complex B) It is slower than if-else statements C) It makes the code easier to read D) It cannot handle multiple cases

Answer: C

10. Which of the following is a common use case for switch statements? A) To sort data in ascending order B) To implement a recursive function C) To validate user input D) To create an infinite loop

Answer: C

1. What is the syntax of a switch statement? Answer: The syntax of a switch statement is as follows:

2. What is the difference between a switch statement and an if-else statement? Answer: A switch statement is used to evaluate a variable or expression against a series of values and execute different code blocks based on the match, while an if-else statement is used to execute different code blocks based on a condition.

3. Can a switch statement be nested inside another switch statement? Answer: Yes, a switch statement can be nested inside another switch statement.

4. What is the purpose of the break keyword in a switch statement? Answer: The break keyword is used to exit a switch statement and prevent the execution of the following code blocks.

5. Can a switch statement have multiple cases with the same value? Answer: No, a switch statement cannot have multiple cases with the same value.

6. What is the purpose of the default case in a switch statement? Answer: The default case is executed if none of the cases match the expression.

7. Can a switch statement be used with floating-point numbers in C++? Answer: No, a switch statement cannot be used with floating-point numbers in C++.

8. What happens if a case in a switch statement is missing a break statement? Answer: If a case in a switch statement is missing a break statement, the program will continue to execute the code blocks of the following cases until a break statement is encountered or the switch statement is exited.

9. Can a switch statement be used with strings in C++? Answer: Yes, a switch statement can be used with strings in C++.

10. What are the advantages of using a switch statement over an if-else statement? Answer: The advantages of using a switch statement over an if-else statement are better readability and maintainability of code, especially when dealing with a large number of conditions. Switch statements can also improve performance in certain situations.

A switch statement is a programming construct that allows a programmer to evaluate a variable or expression against a series of values and execute different code blocks based on the match. It is commonly used as an alternative to nested if-else statements for better readability and maintainability of code. The syntax of a switch statement consists of the switch keyword followed by an expression in parentheses, and a series of cases with matching values followed by a colon and a code block to execute. The code block for each case is executed if the expression matches the value of the case. The break keyword is used to exit the switch statement and prevent the execution of the following code blocks. The default case is executed if none of the cases match the expression. One of the advantages of using a switch statement is that it can improve the performance of code by reducing the number of comparisons required when compared to nested if-else statements. Additionally, switch statements can make code easier to read and understand, especially when dealing with a large number of conditions. However, there are some limitations and rules associated with switch statements in some programming languages. For example, in C++, switch statements can only be used with integral types like int and char, and not with floating-point types. Additionally, switch statements cannot have multiple cases with the same value and must have at least one case or a default case. In some programming languages, like Java, switch statements can also be used with strings. This allows for more flexibility and can make code more concise and easier to read. In Java, the break keyword is used to exit the switch statement, and the default case is optional. In conclusion, switch statements are a powerful programming construct that can make code more readable and efficient when used correctly. They are a great alternative to nested if-else statements and can be used with different data types depending on the programming language. However, it is important to understand the rules and limitations associated with switch statements to use them effectively.