C: an advanced introduction by Narain Gehani

By Narain Gehani

Gehani N. C.. a sophisticated advent (Computer technological know-how Press, 1985)(ISBN 0881750530)(346s)

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The address of a defined object can be determined by using the address of operator &. For example, consider the variables i and pi defined as int i, *pi; The assignment pi = &i; allows the object with name i to also be referred to via the pointer pi by using the notation *pi. The names i and *pi are aliases. The use of the address of operator can also lead to the dangling reference problem. It is also the standard means of simulating passing parameters by reference (see Chapter 5 titled Functions and Complete Programs).

3 The Declarators Each declarator contains exactly one identifier which is the name being given to the object being declared or defined by the declarator. Declarators must be separated by commas: declarator, declarator, ... , declarator The form and semantics of the declarators are explained in the table given below. Assume that T is the data type specified in the object definition: Types and Variables 49 declarator meaning identifier identifier of type T is being defined ( declarator) same as declarator * declarator same as declarator in an object definition with the data type pointer to T declarator ( ) same as declarator in an object definition with the data type function returning a value of type T declarator [ N ] same as declarator in an object definition with the data type array with N elements of type T; N is a constant expression and the elements are numbered from 0 to N- 1 There are some restrictions on the declarators allowed.

5 Pointing to Defined Objects: Pointers can point to defined objects. The address of a defined object can be determined by using the address of operator &. For example, consider the variables i and pi defined as int i, *pi; The assignment pi = &i; allows the object with name i to also be referred to via the pointer pi by using the notation *pi. The names i and *pi are aliases. The use of the address of operator can also lead to the dangling reference problem. It is also the standard means of simulating passing parameters by reference (see Chapter 5 titled Functions and Complete Programs).

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