в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:19:20Z

1 версия

Новая страница

==Block scope.==

<source lang="csharp">using System;

class Example {
public static void Main() {
int x; // known to all code within Main()

x = 10;
if(x == 10) { // start new scope
int y = 20; // known only to this block

// x and y both known here.
Console.WriteLine("x and y: " + x + " " + y);
}
// y = 100; // Error! y not known here

// x is still known here.
Console.WriteLine("x is " + x);
}
}</source>
<pre class=codeResult>x and y: 10 20
x is 10</pre>

==Lifetime of a variable.==

<source lang="csharp">using System;

class Example {
public static void Main() {
int x;

for(x = 0; x < 3; x++) {
int y = -1;
Console.WriteLine("y is initialized each time block is entered.");
Console.WriteLine("y is always -1: " + y);
y = 100;
Console.WriteLine("y is now: " + y);
}
}
}</source>
<pre class=codeResult>y is initialized each time block is entered.
y is always -1: -1
y is now: 100
y is initialized each time block is entered.
y is always -1: -1
y is now: 100
y is initialized each time block is entered.
y is always -1: -1
y is now: 100</pre>

==The Scope and Lifetime of Variables==

<OL><LI>A block is begun with an opening curly brace and ended by a closing curly brace.</LI><LI>A block defines a declaration space, or scope.</LI><LI>Each time you start a new block, you are creating a new scope.</LI><LI>Variables are created when their scope is entered and destroyed when their scope is left.</LI></OL>
1.10.Variable Scope
1.10.1.
The Scope and Lifetime of Variables
1.10.2.
<A href="/Tutorial/CSharp/0020__Language-Basics/Blockscope.htm">Block scope.</a>
1.10.3.
<A href="/Tutorial/CSharp/0020__Language-Basics/Lifetimeofavariable.htm">Lifetime of a variable.</a>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/Language Basics/Variable Scope - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия