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Lecture Comments (1)

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Post by Emanuel Fonseca on May 8, 2017

Im doing turning machines and I could not find anything on this website to help me could you please help me with this problem

Unless otherwise stated, M and N are TM’s, G and H are CFG’s; The alphabet ? is {0.1}. Decide whether each of the following sets is (A) computable, (B) c.e. but not computable or (C) not c.e.

I think its C not C.E

{?G?: L(G) is infinite.}

Exception Handling

  • An error that arises through mistakes in coding or through incorrect data entered by the user is called an “exception”
  • Such errors that are encountered while a program runs are said to be “thrown”
  • Programmers try to anticipate these errors and either prevent or solve them before they happen
  • Java uses the “Try... Catch...” process in order to try running a block of code to test for errors and then catch an error if it occurs
  • All “Try” statements must be followed by at least one “Catch” statement or a “Finally” statement
  • Exceptions that occur that are not handled by a “Catch” block of code or a “Finally” block will cause a program to terminate

Exception Handling

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • What is Exception Handling? 0:09
    • Definition of Exception Handling
  • Why Account for Errors? 1:31
    • Why Account for Errors?
  • Common Types of Errors 3:51
    • User Caused
    • Programmer or System Caused
  • Using the 'Try… Catch' Process 7:30
    • Try
    • Catch
  • Try… Catch Syntax 8:51
    • Try… Catch Syntax
  • Uncaught Exceptions 9:44
    • Handling Uncaught Exceptions
  • Throw' Statement 11:03
    • Throw Statement
    • Throw Syntax
  • Example 1: Program to Catch Divide by Zero Error 11:41
  • Example 2: Program to Demonstrate Finally Keyword 16:18
  • Example 3: Superclass and Subclass Exceptions 19:20