int mult2(int n) 
{ 
     return n*2; 
}
int _tmain(int argc, _TCHAR* argv[])
{
     int num;
     cout << "Enter a number: ";
     cin >> num;
     int numspitout=mult2(num);
     cout << num << " * 2 = " << numspitout << "\n";
     return 0;
}