实验6-模板类、文件I/O和异常处理

Vector.hpp

 1 #ifndef VECTOR_HPP
 2 #define VECTOR_HPP
 3 
 4 #include <iostream>
 5 #include <stdexcept>
 6 
 7 template<class T>
 8 class Vector {
 9 private:
10     T* arr; 
11     int size; 
12 
13 public:
14     Vector() : arr(nullptr), size(0) {} 
15 
16     Vector(int n) : size(n) { 
17         arr = new T[size];
18     }
19 
20     Vector(int n, const T& value) : size(n) { 
21         arr = new T[size];
22         for (int i = 0; i < size; i++) {
23             arr[i] = value;
24         }
25     }
26 
27     Vector(const Vector<T>& other) { 
28         size = other.size;
29         arr = new T[size];
30         for (int i = 0; i < size; i++) {
31             arr[i] = other.arr[i];
32         }
33     }
34 
35     ~Vector() { 
36         delete[] arr;
37     }
38 
39     int get_size() const { 
40         return size;
41     }
42 
43     T& at(int index) { 
44         if (index < 0 || index >= size) {
45             throw std::out_of_range("Index out of range");
46         }
47         return arr[index];
48     }
49 
50     T& operator[](int index) { 
51         return at(index);
52     }
53 
54     Vector<T>& operator=(const Vector<T>& other) { 
55         if (this != &other) {
56             delete[] arr;
57             size = other.size;
58             arr = new T[size];
59             for (int i = 0; i < size; i++) {
60                 arr[i] = other.arr[i];
61             }
62         }
63         return *this;
64     }
65 
66     friend void output(const Vector<T>& vec) { 
67         for (int i = 0; i < vec.size; i++) {
68             std::cout << vec.arr[i] << " ";
69         }
70         std::cout << std::endl;
71     }
72 };
73 
74 #endif

task4.cpp

 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 * 0.7;
13 
14     output(x1);
15 
16     Vector<int> x2(n, 42);
17     Vector<int> x3(x2);
18 
19     output(x2);
20     output(x3);
21 
22     x2.at(0) = 77;
23     output(x2);
24 
25     x3[0] = 999;
26     output(x3);
27 }
28 
29 int main() {
30     test();
31 }

运行结果截图

task5.cpp

 1 #include<iostream>
 2 #include<iomanip>
 3 #include<fstream>
 4 
 5 using namespace std;
 6 
 7 void output(ostream &out) {
 8      for(int i=0;i<=26;i++){
 9         for(int j=0;j<=26;j++)
10          {
11             char c,b;
12             if(i==0&&j==0){
13             char d = ' ';
14              out<<setw(2)<<d;
15              }
16             else if(j==0&&i!=0){
17                 out<<setw(2)<<i;
18             }
19             else if(i==0&&j!=0){
20                  char c='a'+j-1;
21                 out<<setw(2)<<c;
22              }
23             else if(i!=0&&j!=0){
24                  char b=(i+j-1+26)%26+'A';
25                  out<<setw(2)<<b;
26              }
27         }
28          out<<endl;
29      }
30  }
31 int main(){
32     output(cout);
33  
34     ofstream outFile("cipher_key.txt");
35     output(outFile);
36     outFile.close();
37  
38     return 0;
39  }

运行结果截图