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Epsilon User's Manual and Reference
   Epsilon Extension Language
      . . .
      Scope of Variables
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         Declarations
         Simple Declarators
         Pointer Declarators
         Array Declarators
         Function Declarators
         . . .
      Initialization
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Epsilon User's Manual and Reference > Epsilon Extension Language > Data Types >

Pointer Declarators

Pointer declarators are used in conjunction with type specifiers to declare variables of type pointer to t, where t is some type. The form of a pointer declarator is

* declarator

Suppose T is a type specifier and D is a declarator, and the declaration "T D;" declares the identifier embedded in D to be of type "... T". Then the declaration T *D; declares the identifier in D to be of type "... pointer to T". Several examples illustrate the concept.

int l;
int *lptr;
int **ldblptr;

Clearly, the first declaration declares l to be of type int. The type specifier is int and the declarator is l.

The second line is a little more complicated. The type specifier is still int, but the declarator is *lptr. Using the rule above, we see that lptr is a pointer to an int. This is immediately clear from the above if you substitute "int" for T, and "lptr" for D.

Similarly, the third line declares ldblptr to be a pointer to a pointer to an int.



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