Thread: struct in function

I made this script to start a program:

Code:

#include <iostream.h>
#include <windows.h>

using namespace std;

struct exec
{
  char path[];
  char par[];
  char dir[];
};

void execute (exec *x)
{

  HINSTANCE hRet = ShellExecute(
    HWND_DESKTOP, //Parent window
    "open",       //Operation to perform
    x->path,       //Path to program
    x->par,         //Parameters
    x->dir,         //Default directory
    SW_SHOW);     //How to open

  if((LONG)hRet <= 32)
  {
    cout << "Wrong directory!!" << endl;
  }
}

int main()
{
  cout << "Starting firefox..." << endl;
  exec pars = {"C:\\Program Files\\Mozilla Firefox\\firefox.exe", "", ""};
  execute(&pars);
  system("PAUSE");

  return 0;
}

No errors (Win XP, Borland), but when I execute the file, it couts:
"Wrong directory!". What am I doing wrong??