实验六

task4源代码：

 1 #pragma once
 2 
 3 #include<iostream>
 4 #include<stdexcept>
 5 #include<cassert>
 6 #include<iomanip>
 7 
 8 using namespace std;
 9 
10 template <typename T>
11 class Vector {
12     public:
13         Vector(int size){
14     if(size < 0) {
15         throw length_error("Vector constructor:negative size");
16     }
17     this->size = size;
18     ptr = new T[this->size];
19 }
20 
21         Vector(int size, T value) {
22     if(size < 0) {
23         throw length_error("Vector construtor:negative size");
24     }
25     this->size = size;
26     ptr = new T[size];
27     for(auto i=0;i<size;i++) {
28         ptr[i] = value;
29     }
30 }
31 
32         Vector(const Vector<T>& x) {
33     size = x.size;
34     ptr = new T[size];
35     for(auto i=0;i<size;i++) {
36         ptr[i] = x.ptr[i];
37     }
38 }
39         
40         ~Vector() { delete[] ptr; }
41         
42         int get_size() { return size; }
43         
44         T& at(int i) const {
45             assert(i >= 0 && i < size);
46             return(ptr[i]);
47         }
48         
49         T& operator[](int i) { return ptr[i]; }
50         
51         friend void output(Vector<T> x) {
52             for(auto i=0;i<x.get_size();i++) {
53                 cout << x.at(i) << ", ";
54             }
55             cout << "\t\t\n";
56         }
57         
58     private:
59         int size;
60         T* ptr;
61 };

 1 #include"Vector.hpp"
 2 #include<iostream>
 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     
15     output(x1);
16     
17     Vector<int> x2(n, 42);
18     Vector<int> x3(x2);
19     
20     output(x2);
21     output(x3);
22     
23     x2.at(0) = 77;
24     output(x2);
25     
26     x3[0] = 999;
27     output(x3);
28 }
29 
30 int main() {
31     test();
32 }

task4运行结果：

task5源代码：

 1 #include<iostream>
 2 #include<fstream>
 3 #include<iomanip>
 4 
 5 using namespace std;
 6 
 7 void output(std::ostream& output) {
 8     output << "  ";
 9     for(int i=97;i<123;i++) {
10         output << setw(2) << char(i);
11     }
12     output << endl;
13     
14     for(int i=1;i<=26;i++) {
15         output << setw(2) << i;
16         
17         for(int j=i;j<i+26;j++) {
18             output << setw(2) << char(65 + j % 26);
19         }
20         output << endl;
21     }
22 }
23 
24 int main() {
25     ofstream out;
26     output(cout);
27     out.open("cipher_key.txt");
28     output(out);
29     return 0;
30 }

task5运行结果：