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int a,*b=NULL;// "int" is the type specifier,// "a" is a declarator// "*b" is a declarator and NULL is its initializerconstint*f(void);// "int" is the type specifier// "const" is the type qualifier// "*f(void)" is the declaratorenum COLOR{RED, GREEN, BLUE} c;// "enum COLOR {RED, GREEN, BLUE}" is the type specifier// "c" is the declarator

struct C{int member;// "int" is the type specifier// "member" is the declarator} obj,*pObj=&obj;// "struct C { int member; }" is the type specifier// declarator "obj" defines an object of type struct C// declarator "*pObj" declares a pointer to C,// initializer "= &obj" provides the initial value for that pointer int a=1,*p=NULL, f(void),(*pf)(double);// the type specifier is "int"// declarator "a" defines an object of type int//   initializer "=1" provides its initial value// declarator "*p" defines an object of type pointer to int//   initializer "=NULL" provides its initial value// declarator "f(void)" declares a function taking void and returning int// declarator "(*pf)(double)" defines an object of type pointer//   to function taking double and returning int int(*(*foo)(double))[3]=NULL;// the type specifier is int// 1. declarator "(*(*foo)(double))[3]" is an array declarator://    the type declared is "/nested declarator/ array of 3 int"// 2. the nested declarator is "*(*foo)(double))", which is a pointer declarator//    the type declared is "/nested declarator/ pointer to array of 3 int"// 3. the nested declarator is "(*foo)(double)", which is a function declarator//    the type declared is "/nested declarator/ function taking double and returning//        pointer to array of 3 int"// 4. the nested declarator is "(*foo)" which is a (parenthesized, as required by//        function declarator syntax) pointer declarator.//    the type declared is "/nested declarator/ pointer to function taking double//        and returning pointer to array of 3 int"// 5. the nested declarator is "foo", which is an identifier.// The declaration introduces the identifier "foo" to refer to an object of type// "pointer to function taking double and returning pointer to array of 3 int"// The initializer "= NULL" provides the initial value of this pointer. // If "foo" is used in an expression of the form of the declarator, its type would be// int.int x=(*(*foo)(1.2))[0];

int foo(double);// declarationint foo(double x){return x;}// definition

externint n;// declarationint n=10;// definition

struct X;// declarationstruct X{int n;};// definition

externint x;int x=10;// OKexternint x;// OK staticint n;staticint n=10;// OKstaticint n;// OK

typedefint int_t;typedefint int_t;// OK

struct X;struct X{int n;};struct X;