Why does this code shows error?

Question

1.00/5 (1 vote)

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C#

// Namespace Declaration
using System;

// Program start class
class NamedWelcome
{
    // Main begins program execution.
    static void Main(string[] args)
    {
        // Write to console
        Console.WriteLine("Hello, {0}!", args[0]);
        Console.WriteLine("Welcome to the C# Station Tutorial!"); 
    }
}

Every time i fire up this code in visual studio, it shoots an error!

An unhandled exception of type 'System.IndexOutOfRangeException' occurred in ConsoleApplication1.exe

Additional information: Index was outside the bounds of the array.

I couldnt understand why does this happens?
I am a newbee to c# so please help!!

Posted 4-Aug-13 7:52am

AbhinavGauniyal

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Comments

[no name] 4-Aug-13 13:54pm

Because args is empty

AbhinavGauniyal 5-Aug-13 9:17am

Yeah, i understand it now, Thanks!

2 solutions

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Mehdi Gholam · Accepted Answer · 2013-08-04T07:57:00

Solution 1

If you are executing the program without arguments then arg[] will be empty and you will get that exception.

Try running like this from the command line:

c:\>yourprogram.exe abhinav

or change your code to:

C#

if(args.length >0)
        Console.WriteLine("Hello, {0}!", args[0]);
else
        Console.WriteLine("Please supply an argument when executing.");

Posted 4-Aug-13 7:57am

Mehdi Gholam

Comments

ridoy 4-Aug-13 15:53pm

my 5.

Mehdi Gholam 4-Aug-13 15:58pm

Thanks ridoy!

ridoy 4-Aug-13 16:05pm

wc,:)

Maciej Los 4-Aug-13 15:58pm

+5!

Mehdi Gholam 4-Aug-13 16:07pm

Thanks Maciej!

Sergey Alexandrovich Kryukov 4-Aug-13 17:31pm

Sure, a 5.
—SA

Mehdi Gholam 5-Aug-13 0:26am

Thanks Sergey!

AbhinavGauniyal 5-Aug-13 9:19am

Both worked Sir! Thanks!

Maciej Los · Accepted Answer · 2013-08-04T10:02:00

Solution 2

Solution 1 is very good. For further information, see here:
Command Line Parameters Tutorial[^]
Main() and Command-Line Arguments (C# Programming Guide)[^]
Command-Line Arguments (C# Programming Guide)[^]
CP Knowledge Base:
Automatic Command Line Parsing in C#[^]
C#/.NET Command Line Arguments Parser[^]

Posted 4-Aug-13 10:02am

Maciej Los

Comments

Mehdi Gholam 4-Aug-13 16:07pm

5'ed

Maciej Los 4-Aug-13 16:23pm

Thank you, Mehdi ;)

Sergey Alexandrovich Kryukov 4-Aug-13 17:31pm

5ed.
—SA

Maciej Los 4-Aug-13 17:32pm

Thank you, Sergey ;)