实验6 模板类、文件I/O和异常处理

实验任务4
Vector.hpp源代码

 1 #include <iostream>
 2 #include <stdexcept>
 3 
 4 template <typename T>
 5 class Vector {
 6     private:
 7         int size;
 8         T *vec;
 9     public:
10         Vector<T>() = default;
11         Vector<T>(int s);
12         Vector<T>(int s, T t);
13         Vector<T>(const Vector<T> &v);
14         ~Vector<T>();
15         int get_size() const;
16         T& at(int i);
17         T& operator[](int i);
18         template <typename T1>
19         friend void output(const Vector<T1> &v);
20 };
21 template <typename T>
22 Vector<T>::Vector(int s)
23     : size{s} {
24     vec = new T[s];
25 }
26 template <typename T>
27 Vector<T>::Vector(int s, T t)
28     : size{s} {
29     vec = new T[s];
30     for (int i = 0; i < s; i++)
31         vec[i] = t;
32 }
33 template <typename T>
34 Vector<T>::Vector(const Vector<T> &v)
35     : size{v.size} {
36     vec = new T[v.size];
37     for (int i = 0; i < v.size; i++)
38         vec[i] = v.vec[i];
39 }
40 template <typename T>
41 Vector<T>::~Vector() {
42     delete[] vec;
43 }
44 template <typename T>
45 int Vector<T>::get_size() const {
46     return size;
47 }
48 template <typename T>
49 T& Vector<T>::at(int i) {
50     if (i > size) throw std::out_of_range("下标越界");
51     else return vec[i];
52 }
53 template <typename T>
54 T& Vector<T>::operator[](int i) {
55     if (i > size) throw std::out_of_range("下标越界");
56     else return vec[i];
57 }
58 template <typename T1>
59 void output(const Vector<T1> &v) {
60     for (int i = 0; i < v.size; i++)
61         std::cout << v.vec[i] << ", ";
62     std::cout << "\b\b \n";
63 }

 1 #include <iostream>
 2 #include "Vector.hpp"
 3 
 4 void test() {
 5     using namespace std;
 6 
 7     int n;
 8     cin >> n;
 9     
10     Vector<double> x1(n);
11     for(auto i = 0; i < n; ++i)
12         x1.at(i) = i * 0.618;
13 
14     output(x1);
15 
16     Vector<int> x2(n, 777);
17     Vector<int> x3(x2);
18 
19     output(x2);
20     output(x3);
21 
22     x2.at(0) = 42;
23     output(x2);
24 
25     x3[0] = 666;
26     output(x3);
27 }
28 
29 int main() {
30     test();
31 }

 1 #include<iostream>
 2 #include<fstream>
 3 
 4 void output(std::ostream &out) {
 5     for (int i = 0; i <= 26; i++) {
 6         out.width(2);
 7         if (i == 0) out << ' ';
 8         else out << i;
 9         for (int j = 0; j <= 26; j++) {
10             out << ' ';
11             if (i == 0) out << (char)('a' + (i + j) % 26);
12             else out << (char)('A' + (i + j) % 26);
13         }
14         out << '\n';
15     }
16 }
17 void output() {
18     output(std::cout);
19     std::ofstream ofile;
20     ofile.open("cipher_key.txt");
21     output(ofile);
22     ofile.close();
23 }
24 int main() {
25     output();
26 }

运行测试截图