I'm getting error , pls help

Hello all,
I recently started to learn C++ , now i made this really simple code for a little calculator , here it is :

// operating with variables

#include <iostream>
using namespace std;

int main ()
{
// declaring variables
int a, b;
int result;

// process:
a = 5;
b = 2;
a = a + 1;
result = a - b;

// print out the result
cout << result;

// terminate the program
return 0;
}

and now i want to Debug and eventualy start it , but then i get the error :

Unable to start program 'C/..................../niks.dll

So how can i fix this ? Cus i dont get it ... What did i do wrong ?

I know it hasnt anything to do with hacks (Yet) but pls help me

change application type from dll to console application

where to do that ? i got C++ 210 express ...

Edit : I changed it from .dll to .exe but when i debug it then there opens an empty black window wich closes instantly and then i get this :

'niks.exe': Loaded 'C:\Users\Hoofdaccount\Documents\Visual Studio 2010\Projects\niks\Debug\niks.exe', Symbols loaded.
'niks.exe': Loaded 'C:\Windows\SysWOW64\ntdll.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\mscoree.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\kernel32.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\KernelBase.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\msvcr100d.dll', Symbols loaded.
'niks.exe': Loaded 'C:\Windows\SysWOW64\msvcp100d.dll', Symbols loaded.
'niks.exe': Loaded 'C:\Windows\SysWOW64\advapi32.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\msvcrt.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\sechost.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\rpcrt4.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\sspicli.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\cryptbase.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\msc oreei.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\shlwapi.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\gdi32.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\user32.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\lpk.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\usp10.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\imm32.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\msctf.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr .dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\msvcr100_clr0400.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\assembly\NativeImages_v4.0.30319_32\ms corlib\dc0b188b244ec4a4ccec59ac6f1620ad\mscorlib.n i.dll', Cannot find or open the PDB file
'niks.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib \v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll'
'niks.exe': Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\nls sorting.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\SysWOW64\ole32.dll', Cannot find or open the PDB file
'niks.exe' (Managed (v4.0.30319)): Loaded 'C:\Users\Hoofdaccount\documents\visual studio 2010\Projects\niks\Debug\niks.exe', Symbols loaded.
'niks.exe': Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr jit.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\dia symreader.dll', Cannot find or open the PDB file
'niks.exe': Loaded 'C:\Windows\assembly\NativeImages_v4.0.30319_32\Sy stem\4532468deac0fdeff26329333c7642b6\System.ni.dl l', Cannot find or open the PDB file
'niks.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System \v4.0_4.0.0.0__b77a5c561934e089\System.dll'
The thread 'Win32 Thread' (0x944) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0x314) has exited with code 0 (0x0).
The thread 'Main Thread' (0x15ac) has exited with code 0 (0x0).
The program '[4032] niks.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).
The program '[4032] niks.exe: Native' has exited with code 0 (0x0).

So yeah ... must be doing something wrong ...

Add: cin.get();

If you're using a microsoft compiler hit ctrl+f5, because it closes when debugging is finished, this runs it without debugging, and dlls can't be run directly so use an exe