Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 4) C4431

Error Message

missing type specifier - int assumed. Note: C no longer supports default-int

This error can be generated as a result of compiler conformance work that was done for Visual C++ 2005: Visual C++ no longer creates untyped identifiers as int by default. The type of an identifier must be specified explicitly. See Breaking Changes in the Visual C++ 2005 Compiler for more information.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

Example

The following sample generates C4431.

// C4431.c
// compile with: /c /W4
#pragma warning(default:4431)
i;   // C4431
int i;   // OK

Community Additions

ADD
Show:
© 2015 Microsoft