Answer to Question #325448 in C for Anju

Question

Consider the following declaration and the statements (a) to (d) written in C. Identify the statement which are correct and the ones which has an error, by giving reason. If a statement has an error correct it.

int c = 1, *pc; // declaration

(a) pc = c;

(b) *pc = &c;

(c) pc = &c;

(d) *pc = c; 

Answer 1

(a) has an error. pc is a pointer so it should point to some memory. Correct expression is

pc = &c;

(b) is incorrect. *pc is dereference, that is the value which hold by the address pc, while &c is an address of variable c. Correct expression is

pc = &c;

(c) pc = &c; // is a correct expression

(d) *pc = c; // is a correct expression, provided that before pc was correctly initialized (as in (c))