Improve C2548

docs/error-messages/compiler-errors-2/compiler-error-c2548.md

@@ -1,27 +1,39 @@
 ---
 description: "Learn more about: Compiler Error C2548"
 title: "Compiler Error C2548"
-ms.date: "11/04/2016"
+ms.date: "03/01/2024"
 f1_keywords: ["C2548"]
 helpviewer_keywords: ["C2548"]
-ms.assetid: 01e9c835-9bf3-4020-9295-5ee448c519f3
 ---
 # Compiler Error C2548
 
 'class::member' : missing default parameter for parameter parameter
 
-The default parameter list is missing a parameter. If you supply a default parameter anywhere in a parameter list, you must define default parameters for all subsequent parameters.
+The default parameter list is missing a parameter. If you supply a default parameter anywhere in a parameter list, you must define default parameters for all subsequent parameters in the current declaration or any previous declarations within the same scope.
 
 ## Example
 
-The following sample generates C2548:
+The following sample generates C2548 for:
+
+- `func1` because it's missing the default argument `b`
+- `func3` because it's missing the default argument `c`.
+
+The following sample doesn't generate C2548 for:
+
+- `func2` because all the required default arguments are supplied.
+-  The second `func4` declaration because the default argument `c` is supplied in the preceding declaration and is in the same scope.
+-  The third `func4` declaration because both default arguments `b` and `c` are provided previously.
 
 ```cpp
 // C2548.cpp
 // compile with: /c
-void func( int = 1, int, int = 3);  // C2548
+void func1(int a = 1, int b, int c = 3);   // C2548
+
+void func2(int a = 1, int b = 2, int c = 3);   // OK
+
+void func3(int a, int b = 2, int c);   // C2548
 
-// OK
-void func2( int, int, int = 3);
-void func3( int, int = 2, int = 3);
+void func4(int a, int b, int c = 3);   // OK
+void func4(int a, int b = 2, int c);   // OK
+void func4(int a = 1, int b, int c);   // OK
 ```