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Every C# program must have one class with a method (function) called Main. In the SimpleProgram program shown previously, it was declared in a class called Program. The starting point of execution of every C# program is at the first instruction in Main. The name Main must be capitalized. The simplest form of Main is the following: static void Main( ) { Statements }

The philosophy of simplicity extends to the selection of third-party utilities (toolkits and frameworks). They are integral to function-oriented software, because its inherent swapability makes toolkits and frameworks easier to both use and change at will (than with application-oriented software), so they are abundant parts of these systems. This is possible with standardized interfaces and standardized functionality. But it s crucial to hold as a guide that any utilities are better when they are less invasive to the software that is using them. This means that they shouldn t force significant changes functional contortions to that software; they should strive to allow transparency. So, the philosophy of simplicity extends to the standards as well. It also points out that any designing must take into account

Whitespace in a program refers to characters that do not have a visible output character. Whitespace in source code is ignored by the compiler, but is used by the programmer to make the code clearer and easier to read. Some of the whitespace characters include the following: Space Tab New line Carriage return For example, the following code fragments are treated exactly the same by the compiler in spite of their differences in appearance. // Nicely formatted Main() { Console.WriteLine("Hi, there!"); } // Just concatenated Main(){Console.WriteLine("Hi, there!");}

aforementioned patent, support for writing GIF images was never part of the standard Java libraries. Now that the US patent and its counterparts around the globe have expired, support for writing GIF images is available, free of any legal threats or royalty requirements. Listing 4-7 demonstrates the newly added capabilities.

The statements in C# are very similar to those of C and C++. This section will introduce the general form of statements; the specific statement forms will be covered in 9.

that control can be shifted, to varying degrees, to the using function sets or the used function sets; this is in consideration of the users (developers ) balance between the ability to choose low-level functions and the ability to focus on high-level functionality. Most of a system s documentation is best accomplished within the code. And most of that is best accomplished through practices of clear naming, limited function scoping and, as a cross-check, automated testing. This maximizes dynamic documentation, which absolutely minimizes the need to coordinate documentation with code changes and strongly facilitates refactoring and designing on demand. In essence, the best way to document and test a system is to let the compiler in on as much of the design as possible. Most function-oriented languages support the process of reflection, which is a live summary documentation, for the system itself; this can easily be used to generate dynamic summary documentation.

import import import import javax.imageio.*; java.io.*; java.awt.image.*; java.util.*;

A statement is a source code instruction describing a type or telling the program to perform an action. A simple statement is terminated by a semicolon. For example, the following code is a sequence of two simple statements. The first statement defines a variable named var1 and initializes its value to 5. The second statement prints the value of variable var1 to a window on the screen. int var1 = 5; System.Console.WriteLine("The value of var1 is {0}", var1);

A block is a sequence of zero or more statements enclosed by a matching set of curly braces; it acts as a single syntactic statement. You can create a block from the set of two statements in the preceding example by enclosing the statements in matching curly braces, as shown in the following code: { int var1 = 5; System.Console.WriteLine("The value of var1 is {0}", var1); }

public class ToGif { public static void main(String args[]) throws IOException { System.out.println("Supported Writer Formats:"); System.out.println(Arrays.toString(ImageIO.getWriterFormatNames())); if (args.length == 0) { System.err.println("Missing input filename"); System.exit(-1); } String name = args[0]; File inputFile = new File(name); BufferedImage input = ImageIO.read(inputFile); File outputFile = new File(name+".gif"); ImageIO.write(input, "GIF", outputFile); } }