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CHAP. 61
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pointer cannot be dereferenced. This is a common but fatal error:
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// ERROR: cannot dereference the NULL pointer
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int* p = 0; *p = 22;
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A reasonable precaution is to test a pointer before attempting to dereference it: if (p) *p = 22; // ok This tests the condition (p ! = NULL) because that condition is true precisely when p is nonzero. The name void denotes a special fundamental type. Unlike all the other fundamental types, void can only be used in a derived type:
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// ERROR: no object can have type void // OK The most common use of the type void is to specify that a function does not return a value: void swap(double&, double&); Another, different use of void is to declare a pointer to an object of unknown type: void* p = q; void x; void* p;
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This use is most common in low-level C programs designed to manipulate hardware resources. Review Questions
61 . 6.2 6.3
How do you access the memory address of a variable How do you access the contents of the memory location whose address is stored in a pointer variable Explain the difference between the following two uses of the reference operator SC:
int& r = n; p = &n;
Exnlain the difference between the following two uses of the indirection operator *:
int* q = p; n = *p;
65 . 66 . 60 7 6.8
What is a dangling pointer What dire consequences could result from dereferencing a dangling pointer How can these dire consequences b : avoided What is wrong with the following code: int& r = 22; What is wrong with the following code: int* p = &44; What is wrong with the following code: char c = 'w'; char D = &c;
6. 9
POINTERS AND REFERENCES
[CHAP. 6
6.11 6.12
What is the difference between static binding and dynamic binding What is wrong with the following code: char c = 'WI; char* p = c; What is wrong with the following code: short a[32]; for (int i = 0; i c 32; i++) *a++ = -j-*-j; Determine the value of each of the indicated variables after the following code executes. Assume that integers occupy 4 bytes and that m is stored in memory starting at byte Ox3fffdOO. int m = 44; int* p = &m; int& r = m; int n = (*p)++; int* q = p - 1; r = -k(--p) + 1; ++*q; a. m 6. n c. &m d. *p e. r Classify each of the following as a mutable lvalue, an immutable lvalue, or a non-lvalue: a . double x = 1.23; b. 4.56*x + 7.89 C. const double y = 1.23; d. double a[81 = (0.0); e . a[51 f. double f() { return 1.23; } g . f(1.23) h . double& r = x; i. double* p = &x; . J. *P k . const double* p = &x; 1. double* const p = &x; What is wrong with the following code: float x = 3.14159; float* p = &x; short d = 44; short* q = &d; P = q;
CHAP. 61
POINTERS AND REFERENCES
What is wrong with the following code:
int* p = new int; int* q = new int; tout CC "p = H CC p CC II, p + q = ' << p + q << endl;
6.18 6.19
What is the only thing that you should ever do with the NULL pointer In the following declaration, explain what type p is, and describe how it might be used:
double**** p;
If x has the address lowing:
f f f dlc, then what will values of p and q be for each of the fol-
double x = 1.01; double* p = &x; double* q = p + 5;
If p and q are pointers to int and n is an int, which of the following are legal: a*P+q b. P-Cl c. p+n d. p-n e. n+p J n-q
6.22 6.23 6.24
What does it mean to say that an array is really a constant pointer How is it possible that a function can access every element of an array when it is passed only the address of the first element Explain why the following three conditions are true for an array a and an int i:
a[i] == *(a + i); *(a + i) == i[a]; a[il == i[a];
Explain the difference between the following two declarations:
double * f(>; double (* f)();
Write a declaration for each of the following: a. an array of 8 floats; b. an array of 8 pointers to float; c. a pointer to an array of 8 floats; d. a pointer to an array of 8 pointers to float; e. a. function that returns a float; f a. function that returns a pointer to a float; pointer to a function that returns a float; PL L Ii . a 1pointer to a function that returns a pointer to a float;
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