Language Basics

Creating an alias

Posted on by coder 
   


using System;
using MyAlias=MyNamespace.Nested.MyClass;

namespace MyNamespace {
  namespace Nested {
       namespace MyClass {
             public class Foo
             {
                  int _Value;
                  public Foo() {
                    _Value = 0;
                  }
                  public int getValue()
                  {
                    return _Value;
                  }
             }
       }
  }
}


class Test {
  public static void Main() {
      MyAlias.Foo myFoo = new MyAlias.Foo();
      Console.WriteLine("Value {0}", myFoo.getValue());
  }
}

Define an alias to represent a namespace

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// 
using CmpDb = YourCompany.SecondPartNamespace.InnerNamespace.YourClass;

namespace YourCompany.SecondPartNamespace {
  namespace InnerNamespace {
    public class YourClass {
      public static void Open( string tblName ) {
         System.Console.WriteLine("{0}", tblName );
      }
    }
  }
}

public class CH1_14 {
  public static void Main() {
    CmpDb.Open("fred");
  }
}

Demonstrate the % operator

Posted on by coder 

   

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate the % operator. 
 
using System; 
 
public class ModDemo {    
  public static void Main() {    
    int iresult, irem; 
    double dresult, drem; 
 
    iresult = 10 / 3; 
    irem = 10 % 3; 
 
    dresult = 10.0 / 3.0; 
    drem = 10.0 % 3.0;  
 
    Console.WriteLine("Result and remainder of 10 / 3: " + 
                       iresult + " " + irem); 
    Console.WriteLine("Result and remainder of 10.0 / 3.0: " + 
                       dresult + " " + drem); 
  }    
}

Mod test

Posted on by coder

/*
Learning C#
by Jesse Liberty

Publisher: O'Reilly
ISBN: 0596003765
*/
using System;
public class ModTester
{

public static int Main()
{
for (int counter=1; counter<=100; counter++) { Console.Write("{0} ", counter); if ( counter % 10 == 0 ) { Console.WriteLine(" {0}", counter); } } return 0; } } [/csharp]

Deal with the arguments

Posted on by coder 
   
 
using System;
class SayHello {
    public static void Main(string[] args) {
        if (args.Length > 0) {
            foreach (string arg in args) {
                if (arg.Equals("/help"))
                    Console.WriteLine("Run this program as follows: sayhello.exe [name1] ");
                else
                    Console.WriteLine("Hello " + "{0}", arg);
            }
        } else
            Console.WriteLine("For help, run sayhello.exe /help");

    }
}

Return different value to the operating system based on the argument length

Posted on by coder 
   
 

using System;
class SayHello {
    public static int Main(string[] args) {
        if (args.Length > 0) {
            foreach (string arg in args) {
                if (arg.Equals("/help")) {
                    Console.WriteLine("Run this program as follows:" +
                              "sayhello.exe [name1] ");
                    return (1);
                } else
                    Console.WriteLine("Hello " + "{0}", arg);
            }
            return (0);
        } else
            Console.WriteLine("For help, run sayhello.exe /help");
        return (2);
    }
}