Q34859: C4047 Occurs when Function Prototype Is Omitted or Misnamed

Article: Q34859
Product(s): See article
Version(s): 5.00 5.10 | 5.10
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | | mspl13_c
Last Modified: 26-AUG-1988

The compiler warning message

"C4047 'operator' : different levels of indirection"

can occur when a function prototype declaration is not specified, when
the header file that contains the declaration is not given in a
#include directive, when a reference to a function is misspelled,
or when a pointer is assigned a value of a different type without
using an appropriate type cast.

When the function declaration is omitted, a default prototype is
created with a return type of int assumed. A later use of the function
then may cause the C4047 warning, such as assigning the return value
of the function to a non-int variable.

If the call to the function is not spelled the same as the name of the
prototype, the prototype will not be referred to, the default
assumption for the function return type will be int, and the warning
may occur.

More information on function prototyping can be found beginning on
Page 169 in Chapter 7 of the "Microsoft C Optimizing Compiler Language
Reference" manual.

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