exam review 3.docx

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University of Manitoba
Computer Science
COMP 2150
John Anderson

An object defined using the dynamic keyword can store anything. In most cases, it behaves like an object. At compile time, an element that is typed as dynamic is assumed to support any operation. One form of run-time error is a logic error. Logic errors are normally associated with programs that run but produce incorrect results. If the application involves a loop, the loop could be performing one too many or one too few times, producing an incorrect result. The Debugger provides commands for controlling the execution of your application. Using the Debugger, you can start or continue execution, break execution, step through an application, or run to a specific point in your program.You can examine the code while it is running to validate that the execution path is what you had intended. Breakpoints are markers that are placed in an application, indicating the program should halt execution when it reaches that point. When the break occurs, the program and the Debugger are said to be in break mode. While in break mode, you can examine expressions to see what values are being generated. If your program is not consistently producing correct results, this enables you to check intermediate values. You also have the capability of setting windows during debugging sessions. The Watch window lets you type in one or more variables or expressions that you want to observe while the program is running. Unlike the Locals window, which shows all variables currently in scope, you selectively identify the variables or expressions for the Watch window. If a program encounters an error such as division by zero during run-time, and the program cannot recover from the error, it raises or throws an exception.When this happens, execution halts in the current method and the common language runtime (CLR) attempts to locate an exception handler to handle the exception. a block of code that is executed when an exception occurs. Another important point to make sure you understand is the fact that control is never returned to the try block after an exception is thrown.The statement that creates a problem in the try block is the last one tried in the try clause.After control is transferred out of the try block, no other statements inside the try block are ever executed. One of the properties of the Exception base class is Message. Message returns a string describing the exception. Because it is a property of the base class, it can be used with any exception object. Example 12-4 includes the Exception class in the argument list for the catch clause.The object identifier e is used to name an object of that class.The object e can now be used with any of the properties or methods of the Exception class. The Message property, associated with object e, is used inside the catch clause to display
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