File executing in cpp

Less than a minute of googling found me this:
http://www.cplusplus.com/reference/cstdlib/system/[^]

You can use ShellExecute[^] if in Windows

I would suggest using ShellExecute.
http://msdn.microsoft.com/en-us/library/windows/desktop/bb762153(v=vs.85).aspx[^]

HINSTANCE ShellExecute(
_In_opt_ HWND hwnd,
_In_opt_ LPCTSTR lpOperation,
_In_ LPCTSTR lpFile,
_In_opt_ LPCTSTR lpParameters,
_In_opt_ LPCTSTR lpDirectory,
_In_ INT nShowCmd
);

The lpOperation parameter should be "OPEN" and then the lpFile should be the batch file.

I did it myself:
process proc;
proc->argument="krun.bat";
proc->filename="cmd.exe";
proc->workingdirectory="folder path";
proc->start();