в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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==Define constants with const keywords==

<OL><LI>The const modifier is used to declare fields or local variables that cannot be changed.</LI><LI>These variables must be given initial values when they are declared.</LI><LI>const implies static.</LI></OL>

<source lang="csharp">using System;
class Constants
{
public const int value1 = 33;
public const string value2 = "Hello";
}
class MainClass
{
public static void Main()
{
Console.WriteLine("{0} {1}",
Constants.value1,
Constants.value2);
}
}</source>
<pre class=codeResult>33 Hello</pre>

==Local Constants==

<source lang="csharp">using System;
class MainClass
{
static void Main()
{
const double PI = 3.1416;
double area = 2 * 2 * PI;

Console.WriteLine("Radius: {0}, Area: {1}", 2, area);
}
}</source>
<pre class=codeResult>Radius: 2, Area: 12.5664</pre>

==The use of "const int"==

<source lang="csharp">class MainClass
{
public static void Main()
{
const int Length = 3;
System.Console.WriteLine(Length);
}
}</source>
<pre class=codeResult>3</pre>

==Use expressions to calculate and display the circumference of a circle==

<source lang="csharp">class MainClass
{
public static void Main()
{
const double Pi = 3.14159;
double diameter = 2.5;
double circumference = Pi * diameter;
System.Console.WriteLine("Circumference = " + circumference);
}
}</source>
<pre class=codeResult>Circumference = 7.853975</pre>

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в 15:31, 26 мая 2010

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