pascal try catch finally

In Pascal, the try, catch, and finally blocks are used for exception handling. The try block contains the code that may potentially throw an exception. If an exception is thrown within the try block, the program will jump to the nearest catch block that can handle that specific exception type. The finally block is optional and is used to specify code that should always be executed, regardless of whether an exception occurred or not.

Here is an example of how the try, catch, and finally blocks are used in Pascal:

try
  // Code that may throw an exception
  // ...
except
  // Exception handling code
  // ...
finally
  // Code that should always be executed
  // ...
end;

In the try block, you would write the code that you want to execute. If an exception occurs, the program will jump to the nearest except block. Inside the except block, you can write code to handle the exception, such as displaying an error message or taking appropriate action. The finally block, if specified, will be executed regardless of whether an exception occurred or not.

It's important to note that in Pascal, you can have multiple except blocks to handle different types of exceptions. The program will jump to the first except block that can handle the specific exception type. If no except block can handle the exception, the program will terminate.

Here is an example with multiple except blocks:

try
  // Code that may throw an exception
  // ...
except
  on E: EDivByZero do
  begin
    // Handle division by zero exception
    // ...
  end;
  on E: ERangeError do
  begin
    // Handle range error exception
    // ...
  end;
else
  begin
    // Handle any other exception
    // ...
  end;
finally
  // Code that should always be executed
  // ...
end;

In this example, the program will check each except block in order and jump to the first one that matches the type of the thrown exception. If none of the except blocks match, the program will execute the code inside the else block. Finally, the finally block will be executed.

That's the basic usage of the try, catch, and finally blocks in Pascal for exception handling. They provide a way to handle and recover from exceptional situations in your code.