Format of a C Decorated Name

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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