Read e-book online A programmer's introduction to C# PDF

By Harvey M. Deitel, Paul J. Deitel, Jeffrey A. Listfield, Tem R. Nieto, Cheryl H. Yaeger, Marina Zlatkina

ISBN-10: 0130461326

ISBN-13: 9780130461322

Written as an creation to the hot C#, this advisor takes the skilled C programmer a number of steps past the fundamentals. It covers items, info varieties, and stream regulate, or even delves into a few heritage at the new Microsoft web Frameworks atmosphere. maintaining in brain that this can be for these accustomed to C (and even Java), the booklet is going into many of the complicated beneficial properties and enhancements present in this new language. It additionally bargains a comparability among C#, C++, visible easy, and Java.

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The integer simpleValue is a member of the class; there can be many different types of members. In the Main() function, the system creates the instance in heap memory, zeroes out all data members of the class, and returns a reference to the instance. A reference is simply a way to refer to an instance. [1] There is no need to specify when an instance is no longer needed. In the preceding example, as soon as the Main() function completes, the reference to the instance will no longer exist. If the reference hasn’t been stored elsewhere, the instance will then be available for reclamation by the garbage collector.

2] A similar effect can be achieved by using interfaces. See Chapter 10, “Interfaces,” for a comparison of the two techniques. Sealed Classes Sealed classes are used to prevent a class from being used as a base class. It is primarily useful to prevent unintended derivation. // error sealed class MyClass { MyClass() {} } class MyNewClass : MyClass { } - 50 - This fails because MyNewClass can’t use MyClass as a base class because MyClass is sealed. Chapter 7: Class Member Accessibility Overview ONE OF THE IMPORTANT DECISIONS to make when designing an object is how accessible to make the members.

In this case, a new exception class can be created. WriteLine("CountIsZeroException: {0}", e); } } } DoAverage() now determines whether there would be an exception (whether count is zero), and if so, creates a CountIsZeroException and throws it. Finally Sometimes, when writing a function, there will be some cleanup that needs to be done before the function completes, such as closing a file. Close(); } // always executed before function exit, even if an // exception was thrown in the try. WriteLine("Exception: {0}", e); } } } This example walks through a file, reading a count and sum from a file and using it to accumulate an average.

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A programmer's introduction to C# by Harvey M. Deitel, Paul J. Deitel, Jeffrey A. Listfield, Tem R. Nieto, Cheryl H. Yaeger, Marina Zlatkina

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