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    <p>Use constructor initializer list to initialize non-static constant members.</p> <p>ISO C++03 says the following things about static data members.</p> <p><code>[class.static.data]</code></p> <p><code>9.4.2 Static data members</code></p> <blockquote> <p>1 A static data member is not part of the subobjects of a class. There is only one copy of a static data member shared by all the objects of the class.`</p> <p>2 The declaration of a static data member in its class definition is not a definition and may be of an incomplete type other than cv-qualified void. The definition for a staticdata member shall appear in a namespace scope enclosing the member’s class definition. In the definition at namespace scope, the name of the static data member shall be qualified by its class name using the :: operator. `</p> <p>If a static data member is of <strong>const integral</strong> or const enumeration type, its declaration in the class definition can specify a <strong>constant-initializer which shall be an integral constant expression</strong> (5.19). In that case, the member can appear in integral constant expressions. <strong>The member shall still be defined in a name-space scope if it is used in the program and the namespace scope definition shall not contain an initializer*</strong>.</p> </blockquote> <pre><code>class A { private: const int a=9; //incorrect static const int b = 10; //declaration (correct) static const double c = 1.3 //incorrect (Only const-static int members can be initialized like that) public: A(): a(9){} }; const int A::b; //definition of const-static int member </code></pre> <p>You can take the address of a static member if (and only if) <a href="http://www2.research.att.com/~bs/bs_faq2.html#in-class" rel="nofollow">it has an out-of-class definition:</a></p> <pre><code>class AE { // ... public: static const int c6 = 7; static const int c7 = 31; }; const int AE::c7; // definition int f() { const int* p1 = &amp;AE::c6; // error: c6 not an lvalue const int* p2 = &amp;AE::c7; // ok // ... } </code></pre>
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    1. COWith out writing Const int A::b i could compile this code successfully !!!!! why ?
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    2. COIf only i don't initailze static const int b with some value it is giving error(if i don't write definition) ? why ?
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    3. COSuccessful compilation has nothing to do with the correctness of your code ->`The member shall still be defined in a name-space scope if it is used in the program and the namespace scope definition shall not contain an initializer`
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