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Answers to Review Questions 61 .
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6.2 6.3
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SC to the variable
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Apply the dereference operator * to the variable * p. The declaration in t & r = n ; declares r to be a reference (alias) for the in t variable n. The assignment p = &n; assigns the address of n to the pointer p.
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6.4 The declaration int * q = p ; declares q to be a pointer (memory address) pointing to the same int to which n points. The assignment n = *p ; assigns to n the int to which p points. 6.5 A dangling pointer is a pointer that has not been initialized. It is dangerous because it could be pointing to unallocated memory, or inaccessible memory. fied variable. If a pointer pointing to inaccessible memory is dereferenced, the program will probably crash (i. e., terminate abruptly).
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66 If a pointer pointing to unallocated memory is dereferenced, it could change the value of some unidenti.
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67 Initialize pointers when they are declared. .
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CHAP. 61
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POINTERS AND REFERENCES
6.8 6.9
You cannot have a reference to a constant; it s address is not accessible. The reference operator SC cannot be applied to a constant.
6.10 The variable p has type char, while the expression &c has type pointer to char. To initialize p to 6~ c, p would have to be declared as type char * . 6.11 Static binding is when memory is allocated at compile time, as with the array declaration:
double a[400];
Dynamic binding is when memory is allocated at run time, by means of the new operator:
double* p; P = new double[400];
6.12 The variable p has type char*, while the expression c has type char. To initialize p to c, p would have the same type as c: either both char or both char *. 6.13 The only problem is that the array name a is a constant pointer, so it cannot be incremented. The following modified code would be okay:
short a[32]; short* p = a; for (int i = 0; i < 32; i++) *p++ = i*i;
6.14 a. m =46 b. n = 44 C . &m = Ox3fffdOO d. *P = 46 e. *r=46 . f *q = 46 6.15 mutable lvalue; not an lvalue; immutable lvalue; immutable lvalue; mutable lvalue; immutable lvalue; mutable lvalue if return type is a non-local reference; otherwise not an lvalue; h . mutable lvalue; i. mutable lvalue; J mutable lvalue, unless p points to a constant, in which case *p is an immutable lvalue; k. mutable lvalue; 1. immutable lvalue; * 6.16 The pointers p and q have different types: p is pointer to f loa t while q is pointer to short. It is an error to assign the address in one pointer type to a different pointer type. 6.17 It is an error to add two pointers. 6.18 Test it to see if it is NULL. In particular, you should never try to dereference it. 6.19 p is a pointer to a pointer to a pointer to a pointer to a dimensional array. a. b. c. d. e. f g.
doubl e. It could be used to represent a four-
POINTERS AND REFERENCES
[CHAP. 6
6.20 The value of p is the same as the address of a:
0x3 f f f dl c. The value of q depends upon s i zeof ( double ) . If objects of type double occupy 8 bytes, then an offset of 8(5) = 40 is added to p, to give q the hexadecimal value 0x3 f f f d4 4.
6.21 The only expressions among these six that are illegal are p + q and n - q. 6.22 The name of an array is a variable that contains the address of the first element of the array. This address
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