Tag: .net

Questions Related to .net

How many times is the test expression of a Select Case evaluated?

.net

  1. 1

  2. 2

  3. Once for each Case.

  4. It depends on the value of the test expression.

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to have knowledge of the Select Case statement and its behavior.

The Select Case statement is a control structure in programming that allows the execution of different code blocks based on the value of a test expression. The test expression is evaluated once, and then the program determines which code block to execute based on the value of the test expression.

Now, let's go through each option and explain why it is right or wrong:

A. Once for each Case: This option is incorrect. The test expression of a Select Case statement is evaluated only once. After evaluating the test expression, the program will execute the code block that matches the value of the test expression and then exit the Select Case statement.

B. It depends on the value of the test expression: This option is incorrect. The test expression of a Select Case statement is evaluated only once, regardless of the value of the test expression. Once the test expression is evaluated, the program will execute the code block that matches the value of the test expression and then exit the Select Case statement.

C. 1: This option is correct. The test expression of a Select Case statement is evaluated only once.

D. 2: This option is incorrect. The test expression of a Select Case statement is evaluated only once, not twice.

The answer is: C

Which is not a type of Select Case test construct?

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  1. simple value

  2. complex value

  3. relational value with Is

  4. range of values with To

  5. All of the above are types of test constructs.

Show answer
Correct Option: B
Explanation:

To determine the correct answer, the user needs to have knowledge of the Select Case statement in programming, specifically the different types of test constructs that can be used in a Select Case statement.

A) Simple value: This is a valid type of test construct in a Select Case statement. It allows you to check if a variable or expression matches a specific value.

B) Complex value: This is also a valid type of test construct in a Select Case statement. It allows you to check if a variable or expression matches a complex condition or pattern.

C) Relational value with Is: This is a valid type of test construct in a Select Case statement. It allows you to check if a variable or expression matches a specific relational condition, such as "Is Nothing" or "Is Empty".

D) Range of values with To: This is a valid type of test construct in a Select Case statement. It allows you to check if a variable or expression falls within a specific range of values using the "To" keyword.

E) All of the above are types of test constructs: This statement is incorrect. One of the types of test constructs mentioned above is not a valid type in a Select Case statement.

The Answer is: B. complex value

What happens in a Select Case construct when a test value matches the test expression?

.net

  1. The corresponding block of statements is run.

  2. The next Case test value is checked.

  3. The Case Else statement is run.

  4. The Select Case construct is exited.

  5. An error is generated.

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to have an understanding of the Select Case construct in programming and how it works.

The Select Case construct is a decision-making structure in programming that allows a program to execute different sections of code based on the value of a test expression. The test expression is compared to each case expression, and if a match is found, the corresponding block of statements under that case is executed.

Now, let's go through each option and explain why it is right or wrong:

A. The corresponding block of statements is run: This option is correct. When a test value matches the test expression in a Select Case construct, the corresponding block of statements under that case is executed.

B. The next Case test value is checked: This option is incorrect. Once a test value matches the test expression in a Select Case construct, the program does not check the next case test value. It executes the corresponding block of statements and exits the Select Case construct.

C. The Case Else statement is run: This option is incorrect. The Case Else statement is only executed if none of the case expressions match the test value.

D. The Select Case construct is exited: This option is incorrect. The Select Case construct is not automatically exited when a test value matches the test expression. It continues to execute the corresponding block of statements for that case.

E. An error is generated: This option is incorrect. When a test value matches the test expression, it is a valid and expected behavior in a Select Case construct. No error is generated in this scenario.

Therefore, the correct answer is:

A. The corresponding block of statements is run

Do...Loop is an iterative statement because it:
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  1. selects a block of statements to run.

  2. runs the same block of statements repeatedly.

  3. selects a block of statements and runs it repeatedly.

  4. selects a block of statements and runs it a specified number of times.

  5. All of the above.

Show answer
Correct Option: B

Which is true of a Do...Loop?

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  1. The While condition goes after the Do keyword.

  2. The Until condition goes after the Do keyword.

  3. The While condition goes after the Loop keyword.

  4. The Until condition goes after the Loop keyword.

  5. All of the above.

Show answer
Correct Option: E

Which Do...Loop statement should be used to process test scores where a test score over 100 is a signal to stop the processing?

.net

  1. Do While Score > 100

  2. Do Until Score > 100

  3. Loop While Score > 100

  4. Loop Until Score > 100

  5. All of the above are valid for this situation.

Show answer
Correct Option: B

In the For...Next statement the default value for the Step is:

.net

  1. -1

  2. 1

  3. 2

  4. There is no default for the step value.

Show answer
Correct Option: B

The For...Next Loop is used when:
.net

  1. a choice is made based on a Boolean condition.

  2. a block of statements is executed an unknown number of times.

  3. a block of statements is executed a known number of times.

  4. Both a and b.

  5. All of the above.

Show answer
Correct Option: C

The advantage of For...Next loops over Do...Loops is that they are:
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  1. easier to read and maintain.

  2. less prone to being infinite loops.

  3. good for working with arrays.

  4. Both a and b.

  5. All of the above.

Show answer
Correct Option: E
Explanation:

The answer to the question is (E) All of the above.

For...Next loops are easier to read and maintain than Do...Loops because they have a more structured syntax. The For...Next loop explicitly states the start, end, and step values for the loop, which makes it easier to understand what the loop is doing. Do...Loops, on the other hand, only specify the start value, and the end value is implicitly assumed to be infinite. This can make Do...Loops more difficult to read and maintain, especially if the loop is complex.

For...Next loops are also less prone to being infinite loops than Do...Loops. This is because the For...Next loop has a specific number of iterations, which is defined by the start, end, and step values. Do...Loops, on the other hand, can potentially run forever if the condition is never met. This can be a problem if the programmer does not carefully consider the condition.

Finally, For...Next loops are good for working with arrays because they can be used to iterate through the elements of an array in a structured way. Do...Loops can also be used to iterate through arrays, but they are not as efficient as For...Next loops.

In conclusion, For...Next loops have several advantages over Do...Loops, including being easier to read and maintain, less prone to being infinite loops, and good for working with arrays.

Here is a table summarizing the advantages of For...Next loops over Do...Loops:

Advantage For...Next Do...Loop
Readability Easier More difficult
Maintainability Easier More difficult
Prone to infinite loops Less prone More prone
Working with arrays Good Not as good

Which is not a valid Exit statement?
.net

  1. Exit Do

  2. Exit For

  3. Exit Form

  4. Exit Select

  5. Exit Sub

Show answer
Correct Option: C
Explanation:

To solve this question, the user needs to be familiar with programming and the concept of exit statements. Exit statements are used to prematurely terminate loops, functions, or procedures in a program.

Now, let's go through each option and explain why it is right or wrong:

A. Exit Do: This option is a valid exit statement in some programming languages, such as Visual Basic. It is used to exit a Do loop.

B. Exit For: This option is a valid exit statement in some programming languages, such as Visual Basic. It is used to exit a For loop.

C. Exit Form: This option is not a valid exit statement. "Form" is typically a term used in graphical user interface (GUI) programming to refer to a window or a user interface element. There is no standard "Exit Form" statement in most programming languages.

D. Exit Select: This option is a valid exit statement in some programming languages, such as Visual Basic. It is used to exit a Select Case or Switch statement.

E. Exit Sub: This option is a valid exit statement in some programming languages, such as Visual Basic. It is used to exit a Subroutine or Function.

Therefore, the correct answer is:

The Answer is: C. Exit Form