C语言程序设计现代方法第十一章答案
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Chapter 11
Answers to Selected Exercises
2. [was #2] (e), (f), and (i) are legal. (a) is illegal because p is a pointer to an integer and i is an integer. (b) is illegal because *p is an integer and &i is a pointer to an integer. (c) is illegal because &p is a pointer to a pointer to an integer and q is a pointer to an integer. (d) is illegal for reasons similar to (c).
(g) is illegal because p is a pointer to an integer and *q is an integer. (h) is illegal because *p is an integer and q is a pointer to an integer.
4. [was #4; modified]
void swap(int *p, int *q)
{
int temp;
temp = *p;
*p = *q;
*q = temp;
}
6. [was #6]
void find_two_largest(int a[], int n, int *largest,
int *second_largest)
{
int i;
if (a[0] > a[1]) {
*largest = a[0];
*second_largest = a[1];
} else {
*largest = a[1];
*second_largest = a[0];
}
for (i = 2; i < n; i++)
if (a[i] > *largest) {
*second_largest = *largest;
*largest = a[i];
} else if (a[i] > *second_largest) *second_largest = a[i];
}