MicrosoftDocs · Rageking8 · Aug 27, 2025 · Aug 27, 2025 · Aug 27, 2025 · Aug 27, 2025
diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4237.md b/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4237.md
@@ -1,18 +1,21 @@
 ---
-description: "Learn more about: Compiler Warning (level 1) C4237"
 title: "Compiler Warning (level 1) C4237"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 1) C4237"
+ms.date: 11/04/2016
 f1_keywords: ["C4237"]
 helpviewer_keywords: ["C4237"]
-ms.assetid: f2e86c4b-80d8-460e-9429-83c5f3f5d7ca
 ---
 # Compiler Warning (level 1) C4237
 
-'keyword' keyword is not yet supported, but reserved for future use
+> 'keyword' keyword is not yet supported, but reserved for future use
+
+## Remarks
 
 A keyword in the C++ specification is not implemented in the Microsoft C++ compiler, but the keyword is not available as a user-defined symbol.
 
-The following sample generates C4237:
+## Example
+
+The following example generates C4237:
 
 ```cpp
 // C4237.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4251.md b/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4251.md
@@ -32,6 +32,8 @@ Think carefully about adding `__declspec(dllexport)` or `__declspec(dllimport)`
 
 ## Example
 
+The following example generates C4251:
+
 ```cpp
 // C4251.cpp
 // Compile with /std:c++20 /EHsc /W2 /c C4251.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4258.md b/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4258.md
@@ -1,16 +1,21 @@
 ---
-description: "Learn more about: Compiler Warning (level 1) C4258"
 title: "Compiler Warning (level 1) C4258"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 1) C4258"
+ms.date: 11/04/2016
 f1_keywords: ["C4258"]
 helpviewer_keywords: ["C4258"]
-ms.assetid: bbb75e6d-6693-4e62-8ed3-b006a0ec55e3
 ---
 # Compiler Warning (level 1) C4258
 
-'variable' : definition from the for loop is ignored; the definition from the enclosing scope is used"
+> 'variable' : definition from the for loop is ignored; the definition from the enclosing scope is used"
+
+## Remarks
+
+Under [/Ze](../../build/reference/za-ze-disable-language-extensions.md) and [/Zc:forScope](../../build/reference/zc-forscope-force-conformance-in-for-loop-scope.md), variables defined in a [for](../../cpp/for-statement-cpp.md) loop go out of scope after the **`for`** loop ends. This warning occurs if a variable with the same name as the loop variable, but defined in the enclosing loop, is used again in the scope containing the **`for`** loop.
+
+## Example
 
-Under [/Ze](../../build/reference/za-ze-disable-language-extensions.md) and [/Zc:forScope](../../build/reference/zc-forscope-force-conformance-in-for-loop-scope.md), variables defined in a [for](../../cpp/for-statement-cpp.md) loop go out of scope after the **`for`** loop ends. This warning occurs if a variable with the same name as the loop variable, but defined in the enclosing loop, is used again in the scope containing the **`for`** loop. For example:
+For example:
 
 ```cpp
 // C4258.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4264.md b/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4264.md
@@ -1,14 +1,16 @@
 ---
-description: "Learn more about: Compiler Warning (level 4, off) C4264"
 title: "Compiler Warning (level 4, off) C4264"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 4, off) C4264"
+ms.date: 11/04/2016
 f1_keywords: ["C4264"]
 helpviewer_keywords: ["C4264"]
 ---
 # Compiler Warning (level 4, off) C4264
 
 > 'virtual_function' : no override available for virtual member function from base 'class'; function is hidden
 
+## Remarks
+
 C4264 is always generated after [C4263](../../error-messages/compiler-warnings/compiler-warning-level-4-c4263.md).
 
 This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4269.md b/docs/error-messages/compiler-warnings/compiler-warning-level-1-c4269.md
@@ -7,12 +7,16 @@ helpviewer_keywords: ["C4269"]
 ---
 # Compiler Warning (level 1) C4269
 
-'identifier' : 'const' automatic data initialized with compiler generated default constructor produces unreliable results
+> 'identifier' : 'const' automatic data initialized with compiler generated default constructor produces unreliable results
+
+## Remarks
 
 A **`const`** automatic instance of a non-trivial class is initialized with a compiler-generated default constructor.
 
 ## Example
 
+The following example generates C4269:
+
 ```cpp
 // C4269.cpp
 // compile with: /c /LD /W1

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-2-c4244.md b/docs/error-messages/compiler-warnings/compiler-warning-level-2-c4244.md
@@ -1,14 +1,15 @@
 ---
-description: "Learn more about: Compiler Warning (level 2) C4244"
 title: "Compiler Warning (level 2) C4244"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 2) C4244"
+ms.date: 11/04/2016
 f1_keywords: ["C4244"]
 helpviewer_keywords: ["C4244"]
-ms.assetid: 2c19d157-21d1-42c2-a6c0-3f30f2ce3813
 ---
 # Compiler Warning (level 2) C4244
 
-'argument' : conversion from 'type1' to 'type2', possible loss of data
+> 'argument' : conversion from 'type1' to 'type2', possible loss of data
+
+## Remarks
 
 A floating point type was converted to an integer type.  A possible loss of data may have occurred.
 
@@ -18,7 +19,7 @@ C4244 can also fire at level 3, and 4; see [Compiler Warning (levels 3 and 4) C4
 
 ## Example
 
-The following sample generates C4244:
+The following example generates C4244:
 
 ```cpp
 // C4244_level2.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-2-c4250.md b/docs/error-messages/compiler-warnings/compiler-warning-level-2-c4250.md
@@ -1,14 +1,15 @@
 ---
-description: "Learn more about: Compiler Warning (level 2) C4250"
 title: "Compiler Warning (level 2) C4250"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 2) C4250"
+ms.date: 11/04/2016
 f1_keywords: ["C4250"]
 helpviewer_keywords: ["C4250"]
-ms.assetid: d47f7249-6b5a-414b-b2d4-56e5d246a782
 ---
 # Compiler Warning (level 2) C4250
 
-'class1' : inherits 'class2::member' via dominance
+> 'class1' : inherits 'class2::member' via dominance
+
+## Remarks
 
 Two or more members have the same name. The one in `class2` is inherited because it is a base class for the other classes that contained this member.
 
@@ -18,6 +19,8 @@ Because a virtual base class is shared among multiple derived classes, a name in
 
 ## Examples
 
+The following example generates C4250:
+
 ```cpp
 // C4250.cpp
 // compile with: /c /W2
@@ -40,7 +43,7 @@ int main() {
 }
 ```
 
-The following sample generates C4250.
+The following example generates C4250.
 
 ```cpp
 // C4250_b.cpp
@@ -71,7 +74,7 @@ int main() {
 }
 ```
 
-This sample shows a more complex situation. The following sample generates C4250.
+This example shows a more complex situation. The following example generates C4250.
 
 ```cpp
 // C4250_c.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4240.md b/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4240.md
@@ -1,19 +1,22 @@
 ---
-description: "Learn more about: Compiler Warning (level 3) C4240"
 title: "Compiler Warning (level 3) C4240"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 3) C4240"
+ms.date: 11/04/2016
 f1_keywords: ["C4240"]
 helpviewer_keywords: ["C4240"]
-ms.assetid: a2657cdb-18e1-493f-882b-4e10c0bca71d
 ---
 # Compiler Warning (level 3) C4240
 
-nonstandard extension used : access to 'classname' now defined to be 'access specifier', previously it was defined to be 'access specifier'
+> nonstandard extension used : access to 'classname' now defined to be 'access specifier', previously it was defined to be 'access specifier'
+
+## Remarks
 
 Under ANSI compatibility ([/Za](../../build/reference/za-ze-disable-language-extensions.md)), you cannot change the access to a nested class. Under the default Microsoft extensions (/Ze), you can, with this warning.
 
 ## Example
 
+The following example generates C4240:
+
 ```cpp
 // C4240.cpp
 // compile with: /W3

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4243.md b/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4243.md
@@ -7,11 +7,15 @@ helpviewer_keywords: ["C4243"]
 ---
 # Compiler Warning (level 3) C4243
 
-'conversion type' conversion exists from 'type1' to 'type2', but is inaccessible
+> 'conversion type' conversion exists from 'type1' to 'type2', but is inaccessible
+
+## Remarks
 
 A pointer to a derived class is converted to a pointer to a base class, but the derived class inherits the base class with private or protected access.
 
-The following sample generates C4243:
+## Example
+
+The following example generates C4243:
 
 ```cpp
 // C4243.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4265.md b/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4265.md
@@ -1,19 +1,23 @@
 ---
-description: "Learn more about: Compiler Warning (level 3, off) C4265"
 title: "Compiler Warning (level 3, off) C4265"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 3, off) C4265"
+ms.date: 11/04/2016
 f1_keywords: ["C4265"]
 helpviewer_keywords: ["C4265"]
 ---
 # Compiler Warning (level 3, off) C4265
 
 > '*classname*': class has virtual functions, but its non-trivial destructor is not virtual; instances of this class may not be destructed correctly
 
+## Remarks
+
 When a class has virtual functions but a nonvirtual destructor, objects of the type might not be destroyed properly when the class is destroyed through a base class pointer.
 
 This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
 
-The following sample generates C4265:
+## Example
+
+The following example generates C4265:
 
 ```cpp
 // C4265.cpp

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4267.md b/docs/error-messages/compiler-warnings/compiler-warning-level-3-c4267.md
@@ -1,14 +1,15 @@
 ---
-description: "Learn more about: Compiler Warning (level 3) C4267"
 title: "Compiler Warning (level 3) C4267"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 3) C4267"
+ms.date: 11/04/2016
 f1_keywords: ["C4267"]
 helpviewer_keywords: ["C4267"]
-ms.assetid: 2fa2f13f-fa4f-47bb-ad8f-6cb19cfc91e6
 ---
 # Compiler Warning (level 3) C4267
 
-'var' : conversion from 'size_t' to 'type', possible loss of data
+> 'var' : conversion from 'size_t' to 'type', possible loss of data
+
+## Remarks
 
 The compiler detected a conversion from `size_t` to a smaller type.
 

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4232.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4232.md
@@ -1,18 +1,21 @@
 ---
-description: "Learn more about: Compiler Warning (level 4) C4232"
 title: "Compiler Warning (level 4) C4232"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 4) C4232"
+ms.date: 11/04/2016
 f1_keywords: ["C4232"]
 helpviewer_keywords: ["C4232"]
-ms.assetid: f92028a5-4ddd-43c1-97f5-4f724e5e14af
 ---
 # Compiler Warning (level 4) C4232
 
-nonstandard extension used : 'identifier' : address of dllimport 'dllimport' is not static, identity not guaranteed
+> nonstandard extension used : 'identifier' : address of dllimport 'dllimport' is not static, identity not guaranteed
+
+## Remarks
 
 Under Microsoft extensions (/Ze), you can give a nonstatic value as the address of a function declared with the **`dllimport`** modifier. Under ANSI compatibility ([/Za](../../build/reference/za-ze-disable-language-extensions.md)), this causes an error.
 
-The following sample generates C4232:
+## Example
+
+The following example generates C4232:
 
 ```c
 // C4232.c

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4233.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4233.md
@@ -1,14 +1,16 @@
 ---
-description: "Learn more about: Compiler Warning (level 1, Error) C4233"
 title: "Compiler Warning (level 1, Error) C4233"
-ms.date: "10/25/2017"
+description: "Learn more about: Compiler Warning (level 1, Error) C4233"
+ms.date: 10/25/2017
 f1_keywords: ["C4233"]
 helpviewer_keywords: ["C4233"]
 ---
 # Compiler Warning (level 1, Error) C4233
 
 > nonstandard extension used: '*keyword*' keyword only supported in C++, not C
 
+## Remarks
+
 The compiler compiled your source code as C rather than C++, and you used a keyword that is only valid in C++. The compiler compiles your source file as C if the extension of the source file is .c or you use [/Tc](../../build/reference/tc-tp-tc-tp-specify-source-file-type.md).
 
 This warning is always issued as an error. Use the [warning](../../preprocessor/warning.md) pragma to disable.
diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4234.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4234.md
@@ -1,14 +1,15 @@
 ---
-description: "Learn more about: Compiler Warning (level 4) C4234"
 title: "Compiler Warning (level 4) C4234"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 4) C4234"
+ms.date: 11/04/2016
 f1_keywords: ["C4234"]
 helpviewer_keywords: ["C4234"]
-ms.assetid: f7fecd5c-8248-4fde-8446-502aedc357ca
 ---
 # Compiler Warning (level 4) C4234
 
-nonstandard extension used: 'keyword' keyword reserved for future use
+> nonstandard extension used: 'keyword' keyword reserved for future use
+
+## Remarks
 
 The compiler does not yet implement the keyword you used.
 

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4238.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4238.md
@@ -1,19 +1,22 @@
 ---
-description: "Learn more about: Compiler Warning (level 4) C4238"
 title: "Compiler Warning (level 4) C4238"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 4) C4238"
+ms.date: 11/04/2016
 f1_keywords: ["C4238"]
 helpviewer_keywords: ["C4238"]
-ms.assetid: 5d4051d3-7b0f-43ea-8c8d-d194bfdceb71
 ---
 # Compiler Warning (level 4) C4238
 
-nonstandard extension used : class rvalue used as lvalue
+> nonstandard extension used : class rvalue used as lvalue
+
+## Remarks
 
 For compatibility with previous versions of Visual C++, Microsoft extensions (**/Ze**) allow you to use a class type as an rvalue in a context that implicitly or explicitly takes its address. In some cases, such as the example below, this can be dangerous.
 
 ## Example
 
+The following example generates C4238:
+
 ```cpp
 // C4238.cpp
 // compile with: /W4 /c

diff --git a/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4239.md b/docs/error-messages/compiler-warnings/compiler-warning-level-4-c4239.md
@@ -1,20 +1,21 @@
 ---
-description: "Learn more about: Compiler Warning (level 4) C4239"
 title: "Compiler Warning (level 4) C4239"
-ms.date: "11/04/2016"
+description: "Learn more about: Compiler Warning (level 4) C4239"
+ms.date: 11/04/2016
 f1_keywords: ["C4239"]
 helpviewer_keywords: ["C4239"]
-ms.assetid: a23dc16a-649e-4870-9a24-275de1584fcd
 ---
 # Compiler Warning (level 4) C4239
 
-nonstandard extension used : 'token' : conversion from 'type' to 'type'
+> nonstandard extension used : 'token' : conversion from 'type' to 'type'
+
+## Remarks
 
 This type conversion is not allowed by the C++ standard, but it is permitted here as an extension. This warning is always followed by at least one line of explanation describing the language rule being violated.
 
 ## Examples
 
-The following sample generates C4239.
+The following example generates C4239.
 
 ```cpp
 // C4239.cpp
@@ -32,7 +33,7 @@ void func(void) {
 
 Conversion from integral type to enum type is not strictly allowed.
 
-The following sample generates C4239.
+The following example generates C4239.
 
 ```cpp
 // C4239b.cpp