Csharp/C Sharp/Language Basics/Variable Scope

Class level Variable scope

<source lang="csharp"> /* C# Programming Tips & Techniques by Charles Wright, Kris Jamsa Publisher: Osborne/McGraw-Hill (December 28, 2001) ISBN: 0072193794

• /

namespace nsScope {

   using System;
   public class Scope
   {
       int Var = 42;
       static public void Main ()
       {
           Scope cls = new Scope();
           int Var = 23;
           Console.WriteLine ("Class variable = " + cls.Var);
           Console.WriteLine ("Function variable = " + Var);
       }
   }

}

      </source>

method scope variable

<source lang="csharp"> using System; class IncDecApp {

   public static void Foo(int j)
   {
       Console.WriteLine("IncDecApp.Foo j = {0}", j);
   }
  
   static void Main(string[] args)
   {
       int i = 1;
  
       Console.WriteLine("Before Foo(i++) = {0}", i);
       Foo(i++);
       Console.WriteLine("After Foo(i++) = {0}", i);
  
       Console.WriteLine();
  
       Console.WriteLine("Before Foo(++i) = {0}", i);
       Foo(++i);
       Console.WriteLine("After Foo(++i) = {0}", i);
   }

}

</source>

Scope class demonstrates instance and local variable scopes.

<source lang="csharp">

using System; public class Scope {

  private int x = 1;
  public void Begin()
  {
     int x = 5; 
     Console.WriteLine(x );
     UseLocalVariable();
     UseInstanceVariable();
     UseLocalVariable();
     UseInstanceVariable();
     Console.WriteLine(x );
  } 
  public void UseLocalVariable()
  {
     int x = 25; 
     Console.WriteLine("UseLocalVariable is {0}", x );
     x++;  
     Console.WriteLine("before exiting UseLocalVariable is {0}", x );
  } 
  public void UseInstanceVariable()
  {
     Console.WriteLine( "instance variable x on entering {0} is {1}","method UseInstanceVariable", x );
     x *= 10;  
     Console.WriteLine( "instance variable x before exiting {0} is {1}","method UseInstanceVariable", x );
  } 

} public class ScopeTest {

  public static void Main( string[] args )
  {
     Scope testScope = new Scope();
     testScope.Begin();
  }

}

      </source>

Scoping in C#.

<source lang="csharp">

using System; class MainClass {

   // Class level x variable
   static int x = 10;
   public static void Main() {
       // Locally defined copy of x
       int x = 5;
       int y = x;
       double z = y + 10.25;
       int a = (int)z;
       Console.WriteLine("X = {0} Y = {1} Z = {2}", x, y, z);
       Console.WriteLine("A = {0}", a);
       Console.WriteLine("Class Level X = {0}", MainClass.x);
   }

}

</source>

System maximums and minimums.

<source lang="csharp">

using System; class MainClass {

   public static void Main() {
       // First, print out the minimum values
       Console.WriteLine("System Minimums\n");
       Console.WriteLine("MinSByte {0}", System.SByte.MinValue);
       Console.WriteLine("MinByte {0}", System.Byte.MinValue);
       Console.WriteLine("MinInt16 {0}", System.Int16.MinValue);
       Console.WriteLine("MinUInt16 {0}", System.UInt16.MinValue);
       Console.WriteLine("MinInt32 {0}", System.Int32.MinValue);
       Console.WriteLine("MinUInt32 {0}", System.UInt32.MinValue);
       Console.WriteLine("MinInt64 {0}", System.Int64.MinValue);
       Console.WriteLine("MinUInt64 {0}", System.UInt64.MinValue);
       Console.WriteLine("MinChar {0}", System.Char.MinValue);
       Console.WriteLine("MinSingle {0}", System.Single.MinValue);
       Console.WriteLine("MinDouble {0}", System.Double.MinValue);
       // Console.WriteLine( "MinBoolean {0}", System.Boolean.MinValue);
       Console.WriteLine("MinDecimal {0}", System.Decimal.MinValue);
       Console.WriteLine("\nSystem Maximums\n");
       Console.WriteLine("MaxSByte {0}", System.SByte.MaxValue);
       Console.WriteLine("MaxByte {0}", System.Byte.MaxValue);
       Console.WriteLine("MaxInt16 {0}", System.Int16.MaxValue);
       Console.WriteLine("MaxUInt16 {0}", System.UInt16.MaxValue);
       Console.WriteLine("MaxInt32 {0}", System.Int32.MaxValue);
       Console.WriteLine("MaxUInt32 {0}", System.UInt32.MaxValue);
       Console.WriteLine("MaxInt64 {0}", System.Int64.MaxValue);
       Console.WriteLine("MaxUInt64 {0}", System.UInt64.MaxValue);
       Console.WriteLine("MaxChar {0}", System.Char.MaxValue);
       Console.WriteLine("MaxSingle {0}", System.Single.MaxValue);
       Console.WriteLine("MaxDouble {0}", System.Double.MaxValue);
       Console.WriteLine("MaxDecimal {0}", System.Decimal.MaxValue);
   }

}

</source>