The form of decoration for a C function depends on the calling convention used in its declaration, as shown below.
| Calling convention | Decoration |
|---|---|
| __cdecl (the default) | Leading underscore (_) |
| __stdcall | Leading underscore (_) and a trailing at sign (@) followed by a number representing the number of bytes in the parameter list |
| __fastcall | Same as __stdcall, but prepended by an at sign instead of an underscore |