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Since its original 10 release, C# has been evolving at a rapid pace Not long after C# 10, Microsoft released version 11 It contained many minor tweaks but added no major features However, the situation was much different with the release of C# 20 C# 20 was a watershed event in the lifecycle of C# because it added many new features, such as generics, partial types, and anonymous methods, that fundamentally expanded the scope, power, and range of the language Version 20 firmly put C# at the forefront of computer language development It also demonstrated Microsoft s long-term commitment to the language The next major release of C# was 30 Because of the many new features added by C# 20, one might have expected the development of C# to slow a bit, just to let programmers catch up, but this was not the case With the release of C# 30, Microsoft once again put C# on the cutting edge of language design, this time adding a set of innovative features that redefined the programming landscape These include lambda expressions, languageintegrated query (LINQ), extension methods, and implicitly typed variables, among others Although all of the new 30 features were important, the two that had the most high-profile impact on the language were LINQ and lambda expressions They added a completely new dimension to C# and further emphasized its lead in the ongoing evolution of computer languages The current release is C# 40, and that is the version of C# described by this book C# 40 builds on the strong foundation established by the previous three major releases, adding several new features Perhaps the most important are named and optional arguments Named arguments let you link an argument with a parameter by name Optional arguments give you a way to specify a default argument for a parameter Another important new feature is the dynamic type, which is used to declare objects that are type-checked at runtime, rather than compile time Covariance and contravariance support is also provided for type parameters, which are supported by new uses of the in and out keywords For those programmers using the Office Automation APIs (and COM in general), access has been simplified (Office Automation and COM are outside the scope of this book) In general, the new 40 features further streamline coding and improve the usability of C# There is another major feature that relates directly to C# 40 programming, but which is provided by the NET Framework 40 This is support for parallel programming through two major new features The first is the Task Parallel Library (TPL) and the second is Parallel LINQ (PLINQ) Both of these dramatically enhance and simplify the process of creating programs that use concurrency Both also make it easier to create multithreaded code that automatically scales to utilize the number of processors available in the computer Put directly, multicore computers are becoming commonplace, and the ability to parallelize your code to take advantage of them is an increasingly important part of nearly every C# programmer s job description Because of the significant impact the TPL and PLINQ are having on programming, both are covered in this book.

Our owers will be perfect, whether the occasion is a wedding, reunion, business meeting or conference, or other event (nineteen words)

Part I:

ConsoleWriteLine(); x = 1; y = 0; ConsoleWriteLine("Series generated using y = y + ++x;"); for(i = 0; i < 10; i++) { y = y + ++x; // prefix ++ ConsoleWriteLine(y + " "); } ConsoleWriteLine(); } }

We will be able to do calculations much more easily if we learn some simple properties of logarithms and exponentials If a > 0 and b > 0 then a(loga b) = b If a > 0 and b R is arbitrary then loga (ab ) = b If a > 0, b > 0, and c > 0 then (i) loga (b c) = loga b + loga c (ii) loga (b/c) = loga b loga c (iii) loga b = (iv) loga b = logc b logc a 1 logb a

The output is shown here:

Series generated using y = y + x++; 1 3 6 10 15 21 28 36 45 55 Series generated using y = y + ++x; 2 5 9 14 20 27 35 44 54 65

y = y + x++;

adds the current values of x and y, and assigns this result back to y The value of x is incremented after its value has been obtained However, the statement

(v) loga 1 = 0 (vi) loga a = 1 (vii) For any exponent , loga (b ) = (loga b)

y = y + ++x;

obtains the value of x, increments x, and then adds that value to the current value of y This result is assigned to y As the output shows, simply changing ++x to x++ changes the number series quite substantially

Let s evaluate the total revision:

4:

log3 81 5 log2 8 3 ln( e4 )

intimidate you Although having two operators back-to-back is a bit unsettling at first glance, the compiler keeps it all straight Just remember, this expression simply adds the value of y to the value of x incremented

In the terms relational operator and logical operator, relational refers to the relationships that values can have with one another, and logical refers to the ways in which true and false values can be connected together Since the relational operators produce true or false results, they often work with the logical operators For this reason they will be discussed together here The relational operators are as follows:

Operator == != > < >= <= Meaning Equal to Not equal to Greater than Less than Greater than or equal to Less than or equal to