C# Graphical Tutorial Chapter 2 C# Programming Overview

C# Programming Overview

A simple C# program

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identifier

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An identifier is a string that names variables , methods , parameters , and many other program constructs that will be explained later .

keywords

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All C# keywords consist of lowercase letters , but .NET type names use the Pascal case convention.

Main: the starting point of the program

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• The executable starting point of the C# program is the first instruction in Main
• The first letter of Main must be capitalized

output text from a program

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BCL (Base Class Library, base class library) provides the Console class (in the System namespace), which contains methods for inputting and outputting data to the console. 
Write

Console.Write("This is trivial text.");

 
WriteLine

System.Console.WriteLine("This is text1.");
System.Console.WriteLine("This is text2.");
System.Console.WriteLine("This is text3.");

 
format string

Console.WriteLine("Two sample integers are {0} and {1}.",3,6);

 
Multiple tags and values

Console.WriteLine("Three integers are {1},{0} and {1}.",3,6);

 
format a string of numbers

Console.WriteLine("The value:{0}.",500);
Console.WriteLine("The value:{0:C}.",500);

★ Alignment Specifier ★

int myInt=500;
Console.WriteLine("|{0,10}|",myInt);
Console.WriteLine("|{0,-10}|",myInt);

format field

double myDouble=12.345678;
Console.WriteLine("{0,-10:G}--General", myDouble);
Console.WriteLine("{0,-10}--Default,same as General", myDouble);
Console.WriteLine("{0,-10:F4}--Fixed Point,4 dec places", myDouble);
Console.WriteLine("{0,-10:C}--Currency", myDouble);
Console.WriteLine("{0,-10:E3}--Sci.Notation,3 dec places", myDouble);
Console.WriteLine("{0,-10:x}--Hexadecimal integer",1194719);

Standard Number Format Specifier

Notes

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 Note: Ctrl K+Ctrl C

 Uncomment: Ctrl K+Ctrl U

Author: Moonache 
Source: http://www.cnblogs.com/moonache/