Variables

Question 1

What are comments in C#?

Answer 1

Comments in C# are non-executable text used to annotate code for better understanding and maintainability. They are ignored by the compiler.

Question 2

What is the syntax for single-line comments in C#?

Answer 2

The syntax for single-line comments is //.

Question 3

What are single-line comments used for?

Answer 3

Single-line comments are used for short explanations or notes on a single line.

Example:
```csharp
// This is a single-line comment
int x = 10; // Initialize x with value 10
~~~

Question 4

What is the syntax for multi-line comments in C#?

Answer 4

The syntax for multi-line comments is /* */.

Question 5

What are multi-line comments used for?

Answer 5

Multi-line comments are used for longer explanations or commenting out multiple lines of code.

Example:
```csharp
/* This is a multi-line comment.
It can span multiple lines. /
int y = 20; / This is also a comment */
~~~

Question 6

What is the syntax for XML documentation comments in C#?

Answer 6

The syntax for XML documentation comments is ///.

Question 7

What are XML documentation comments used for?

Answer 7

XML documentation comments are used to generate XML documentation for the code, which can be used by tools like Visual Studio.

Example:
```csharp
/// <summary>
/// This method adds two integers.
/// </summary>
/// <param></param>The first integer.</param>
/// <param></param>The second integer.</param>
/// <returns>The sum of the two integers.</returns>
public int Add(int a, int b)
{
return a + b;
}
~~~

Question 8

Does C# support nested comments?

Answer 8

C# does not support nested multi-line comments. Attempting to nest /* */ comments will result in a compilation error.

Example (invalid):
```csharp
/* Outer comment
/* Inner comment */ // This will cause an error
*/
~~~

Question 9

What are some commenting best practices in C#?

Answer 9

Use comments to explain why something is done, avoid over-commenting, keep comments up-to-date, and use XML documentation for public APIs.

Question 10

How are comments used to comment out code?

Answer 10

Comments are often used to temporarily disable code during debugging or testing.

Example:
```csharp
// int z = 30; // This line is commented out
/*
Console.WriteLine(“This code is disabled”);
*/
~~~

Question 11

What are special comment tags used for?

Answer 11

Special comment tags like TODO, FIXME, and NOTE are used to mark tasks or issues in the code.

Example:
```csharp
// TODO: Implement this method later
// FIXME: This logic is broken
// NOTE: This is a workaround for issue #123
~~~