5.12

 1 #include<iostream>
 2 using namespace std;
 3 
 4 template<class T>
 5 class mypair {
 6     T a, b;
 7 public:
 8     mypair(T first, T second)
 9     {
10         a = first;
11         b = second;
12     }
13     T getmax();
14 };
15 
16 template<class T>
17 T mypair<T>::getmax()
18 {
19     T retval;
20     retval = a > b ? a : b;
21     return retval;
22 }
23 
24 int main() {
25     mypair<int>myobject(100, 75);
26     cout << myobject.getmax();
27     return 0;
28 }
29  
30 #include<iostream>
31 using namespace std;
32 
33 template <class T,int N>
34 class mysequence {
35     T memblock[N];
36 public:
37     void setmember(int x, T value);
38     T getmember(int x);
39 };
40 
41 template <class T,int N>
42 void mysequence<T, N>::setmember(int x, T value)
43 {
44     memblock[x] = value;
45 }
46 
47 template<class T,int N>
48 T mysequence<T, N>::getmember(int x)
49 {
50     return memblock[x];
51 }
52 
53 int main() {
54     mysequence<int, 5>myints;
55     mysequence<double, 5>myfloats;
56     myints.setmember(0, 100);
57     myfloats.setmember(3, 3.1416);
58     cout << myints.getmember(0) << '\n';
59     cout << myfloats.getmember(3) << '\n';
60     return 0;
61 }

 1 #include<iostream> 
 2 using namespace std;
 3 
 4 template<class T>
 5 void swapData(T& a, T& b)
 6 {
 7     T t = a;
 8     a = b;
 9     b = t;
10 }
11 /*直接选择排序,要求：小的在前大的在后*/
12 template<class T>
13 void selectSort(T a[], int n)
14 {
15     int i, j, k, t;
16     int tmp;
17 
18     for (i = 0; i < n - 1; i++)    /*i比j小1，所以i范围是0~n-1*/
19     {
20         k = i;    /*最小值下标*/
21         for (j = i + 1; j < n; j++)
22             if (a[j] < a[k])
23                 k = j;
24         swapData(a[i], a[k]);
25         for (k = 0;k < n;k++)
26             cout << a[k] << " ";
27         cout << endl;
28     }
29 }
30 int main()
31 {
32     int a[] = { 1,3,5,7,9,11,13,15,17,19,2,4,6,8,10,12,14,16,18,20 };
33 
34     cout << "排序前的数据：" << endl;
35     for (int i = 0; i < 20; i++)
36         cout << a[i] << " ";
37     cout << endl;
38 
39     cout << "进行排序：" << endl;
40     selectSort(a, 20);
41 
42     cout << "排序后的数据：" << endl;
43     for (int i = 0; i < 20; i++)
44         cout << a[i] << " ";
45     cout << endl;
46     return 0;
47 }