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CHAP. 7]
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Explain the difference between the following two uses of the reference operator &:
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True or false Explain: a. If (x == y) then (&x == &y). b. If (x == y) then (*x == *y). a. What is a dangling pointer b. What dire consequences could result from dereferencing a dangling pointer c. How can these dire consequences be avoided What is wrong with the following code:
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What is wrong with the following code:
int* p = &44;
7.10 What is wrong with the following code:
char c = 'w'; char p = &c;
Why couldn t the variable ppn in Example 7.6 on page 160 be declared like this:
int** ppn=&&n;
7.12 What is the difference between static binding and dynamic binding 7.13 What is wrong with the following code:
char c = 'w'; char* p = c;
7.14 What is wrong with the following code:
short a[32]; for (int i = 0; i < 32; i++) *a++ = i*i;
7.15 Determine the value of each of the indicated variables after the following code executes. Assume that each integer occupies 4 bytes and that m is stored in memory starting at byte 0x3fffd00.
int m = 44; int* p = &m; int& r = m; int n = (*p)++; int* q = p - 1; r = *(--p) + 1; ++*q; m n &m *p r *q
a. b. c. d. e. f. 7.16 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;
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[CHAP. 7
d. double a[8] = {0.0}; e. a[5] 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; l. double* const p = &x; 7.17 What is wrong with the following code:
float x = 3.14159; float* p = &x; short d = 44; short* q = &d; p = q;
7.18 What is wrong with the following code:
int* p = new int; int* q = new int; cout << "p = " << p << ", p + q = " << p + q << endl; 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 0x3fffd1c, then what will values of p and q be for each of the fol-
7.19 7.20 7.21
lowing:
double x = 1.01; double* p = &x; double* q = p + 5; p and q are pointers to int and n is an int, which of the following are legal: p + q p q p + n p n n + p n q
7.22 If a. b. c. d. e. f. 7.23 What does it mean to say that an array is really a constant pointer 7.24 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 7.25 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[i] == i[a];
7.26 Explain the difference between the following two declarations:
double * f(); double (* f)();
7.27 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;
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