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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: All
Jul 20, 2000

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Precedence of the * and []Operators

The array subscript operator, [], has a higher precedence than the pointer dereference operator, *. Therefore, the following snippet declares an array of 10 pointers to char, not a pointer to an array of 10 characters:

 
char * p2 [10];

You can read the declaration as follows: because the array subscript has a higher precedence than the * operator, p2 is an array of 10 elements. The type of the elements is 'pointer to char' or char *. Now try to parse the following declaration:

 
char ** p3 [10];

Here again, operator [] has the highest precedence, therefore we know that p3 is an array with 10 elements. The type of the array's elements is 'pointer to pointer to char' or char **.

Danny Kalev
 
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