Exception Handling in Computer Programming

Play an AI-generated podcast conversation about this lesson

Which keyword is used to re-throw an exception in C#?

catch

throw (correct)

try

finally

What is the purpose of the `checked` keyword in C#?

To disable exception handling

To handle checked exceptions

To explicitly enable arithmetic overflow checking (correct)

To check if an exception has occurred

What is the purpose of the `finally` block in a try-catch-finally statement?

To specify the code that will be executed only if an exception occurs

To specify the code that will be executed regardless of whether an exception occurs or not (correct)

To catch and handle exceptions

To throw a new exception

What does the `catch` block in a try-catch-finally statement do?

It catches and handles exceptions Signup and view all the answers

What happens when an exception is thrown in a method?

The method is terminated and the exception is propagated to the calling method Signup and view all the answers

What is the basic structure of a try-catch block in C# and how would you use each part?

The basic structure of a try-catch block in C# consists of the 'try' keyword followed by a block of code that may throw an exception. The 'catch' keyword is then used to specify the type of exception to catch, followed by a block of code that handles the exception. Within the catch block, the exception object can be accessed using the 'e' parameter. Finally, the 'finally' block (optional) is used to specify a block of code that is always executed, regardless of whether an exception is thrown or not. Signup and view all the answers

What is the difference between 'TryParse' and using exceptions to handle invalid input in C#?

'TryParse' is a method in C# that attempts to parse a string representation of a value and returns a boolean indicating whether the parsing was successful or not. It does not throw an exception when the input is invalid. On the other hand, using exceptions to handle invalid input involves throwing an exception when the input is invalid, and then catching and handling the exception in the code. The choice between 'TryParse' and exceptions depends on the specific requirements and design of the program. Signup and view all the answers

When should the 'checked' keyword be used in C#?

The 'checked' keyword in C# is used to explicitly enable overflow checking for integral arithmetic operations. By default, overflow checking is not performed in C#. When the 'checked' keyword is used, any arithmetic operation that results in an overflow will throw a 'System.OverflowException'. The 'checked' keyword should be used when there is a need to explicitly handle or detect overflows in the program. Signup and view all the answers

What is the purpose of the 'throw' keyword in C#?

The 'throw' keyword in C# is used to manually throw an exception. It is followed by an exception object or an expression that evaluates to an exception object. When the 'throw' keyword is encountered, the normal execution flow is interrupted and the specified exception is thrown. This allows for customized handling of exceptional situations in the code. Signup and view all the answers

How are exception objects created and received in C#?

Exception objects in C# are created when an exception is thrown using the 'throw' keyword. The 'throw' statement can specify a new instance of an exception class or an existing exception object. When an exception is thrown, it can be caught and handled using a 'catch' block. The 'catch' block specifies the type of exception to catch and receives the exception object as a parameter, typically named 'e'. The exception object can then be used to obtain information about the exception and perform appropriate handling. Signup and view all the answers