4.

4.#

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生命期

 1#include <iostream>
 2
 3using namespace std;
 4
 5template <class T>
 6class CL {
 7 private:
 8  T a[10];
 9  int num;
10
11 public:
12  CL() {
13    num = 0;
14  }
15  void set(int i, T val) {
16    a[i] = val;
17    num++;  //?
18  }
19  T Re(int i) {
20    return a[i];
21  }
22  void out() {
23    cout << '{';
24    for (int i = 0; i < num - 1; i++) {
25      cout << a[i] << ", ";
26    }
27    cout << a[num - 1] << '}' << endl;
28  }
29};
30
31int main() {
32  CL<int> a;
33  CL<double> b;
34  CL<char> c;
35  for (int i = 0; i < 5; i++) {
36    a.set(i, i), b.set(i, i * 1.1), c.set(i, i + 'A');
37  }
38  a.out();
39  b.out();
40  c.out();
41  cout << "int  2..... is: " << a.Re(2) << endl;
42  cout << "char  3..... is: " << c.Re(3) << endl;
43  /* 之后的部分忘记了 */
44}

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[在线代码 bf6j9nYf5]

1{0, 1, 2, 3, 4}
2{0, 1.1, 2.2, 3.3, 4.4}
3{A, B, C, D, E}
4int  2..... is: 2
5char  3..... is: D