Awesome, now we have solutions on C, C# and Java.
Few questions,
 @kalo_chasma:
Do we really need following imports(in java term)? All of them?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

Will it be better to write

            for (int i = a; i <= b; i++)
            {
                Console.Write("\t" + i);
            }
            Console.WriteLine();

I tried for (int i = a; i <= b; i++) but looks like codepad C doesnt support it, or may be C doesnt support it.


@Ayus,
   We can for sure do
    for (int i = a; i <=b; i++)  in java right?
    Also isn't it better to use   String.format()  in java?
    why are all those " " + " " , is it even necessary? 

Just few comments.