实验六

实验任务5：

（1）代码部分：

  1 #pragma once
  2 #include<iostream>
  3 #include<cstring>
  4 
  5 using namespace std;
  6 
  7 template<class T>
  8 class Vector {
  9 public:
 10     Vector(int n, int value=0);
 11     Vector(const Vector& v) :data{ v.data }, size{v.size} {};
 12     ~Vector();
 13     int get_size() const {
 14         return size;
 15     }
 16     T& at(int index) const {
 17         if (index<0||index >= size)
 18             throw out_of_range("index out of range");
 19         return data[index];
 20     }
 21     T& at(int index) {
 22         return static_cast<const Vector<T>*>(this)->at(index);
 23     }
 24 
 25     T& operator[](int index) const {
 26         if (index < 0 || index >= size)
 27             throw out_of_range("index out of range");
 28         return data[index];
 29     }
 30 
 31 private:
 32     T* data;
 33     int size;
 34 };
 35 
 36 template<class T>
 37 Vector<T>::Vector(int n, int value) {
 38     if (n < 0)
 39         throw length_error("negative size");
 40     this->size = n;
 41     this->data = new T[size];
 42     for (int i = 0;i < size;i++)
 43         data[i] = value;
 44 }
 45 
 46 template<class T>
 47 Vector<T>::~Vector() {
 48     if (data != NULL) {
 49         delete[] data;
 50         data = NULL;
 51     }
 52 }
 53 
 54 template < typename T1>
 55 void output(const Vector<T1>&v) {
 56         for (int i = 0; i < v.get_size()-1;i++) {
 57                 cout << v[i] << ", ";
 58     }
 59         cout << v[v.get_size() - 1];
 60         cout << endl;
 61 }
 62 #include <iostream>
 63 #include "Vector.hpp"
 64 
 65 void test1() {
 66     using namespace std;
 67 
 68     int n;
 69     cout << "Enter n: ";
 70     cin >> n;
 71 
 72     Vector<double> x1(n);
 73     for (auto i = 0; i < n; ++i)
 74         x1.at(i) = i * 0.7;
 75 
 76     cout << "x1: "; output(x1);
 77 
 78     Vector<int> x2(n, 42);
 79     const Vector<int> x3(x2);
 80 
 81     cout << "x2: "; output(x2);
 82     cout << "x3: "; output(x3);
 83 
 84     x2.at(0) = 77;
 85     x2.at(1) = 777;
 86     cout << "x2: "; output(x2);
 87     cout << "x3: "; output(x3);
 88 }
 89 
 90 void test2() {
 91     using namespace std;
 92 
 93     int n, index;
 94     while (cout << "Enter n and index: ", cin >> n >> index) {
 95         try {
 96             Vector<int> v(n, n);
 97             v.at(index) = -999;
 98             cout << "v: "; output(v);
 99         }
100         catch (const exception& e) {
101             cout << e.what() << endl;
102         }
103     }
104 }
105 
106 int main() {
107     cout << "测试1: 模板类接口测试\n";
108     test1();
109 
110     cout << "\n测试2: 模板类异常处理测试\n";
111     test2();
112 }
View Code

（2）运行结果：

 

实验任务5：

（1）代码部分：

  1 #pragma once
  2 #include<iostream>
  3 #include<iomanip>
  4 #include<string>
  5 
  6 using std::string;
  7 using std::ostream;
  8 using std::istream;
  9 using std::setw;
 10 using std::ios_base;
 11 using std::setiosflags;
 12 
 13 class member {
 14 public:
 15     member() = default;
 16     ~member() = default;
 17     string get_course()const {
 18         return course;
 19     }
 20 
 21     int get_score()const {
 22         return score;
 23     }
 24 
 25     friend ostream& operator << (ostream & out, const member & m);
 26     friend istream& operator >> (istream& in, member& m);
 27 private:
 28     string number;
 29     string name;
 30     string course;
 31     int score;
 32 };
 33 
 34 ostream& operator << (ostream& out, const member& m) {
 35     out << setiosflags(ios_base::left);
 36     out << setw(15) << m.number
 37         << setw(15) << m.name
 38         << setw(15) << m.course
 39         << setw(5) << m.score;
 40 
 41     return out;
 42 }
 43 
 44 istream& operator >> (istream& in, member& m) {
 45     in >> m.number >> m.name >> m.course >> m.score;
 46     return in;
 47 }
 48 
 49 
 50 #include"member.hpp"
 51 #include<vector>
 52 #include<iostream>
 53 #include<fstream>
 54 #include<string>
 55 #include<vector>
 56 
 57 bool compare(const member& m1, const member& m2) {
 58     if (m1.get_course() < m2.get_course())
 59         return true;
 60     if (m1.get_course() == m2.get_course())
 61         return m1.get_score()>m2.get_score();
 62     return false;
 63 }
 64 
 65 void output(ostream& out,const std::vector<member>& v) {
 66     for (auto& i : v) {
 67         out << i << std::endl;
 68     }
 69 }
 70 
 71 void save(const std::string& filename, std::vector<member>& v) {
 72     using std::ofstream;
 73 
 74     ofstream out(filename);
 75     if (!out.is_open()) {
 76         std::cout << "fail to open file to write\n";
 77         return;
 78     }
 79 
 80     output(out, v);
 81     out.close();
 82 }
 83 
 84 void load(const std::string& filename, std::vector<member>& v) {
 85     using std::ifstream;
 86 
 87     ifstream in(filename);
 88     if (!in.is_open()) {
 89         std::cout << "fail to open file to read\n";
 90         return;
 91     }
 92 
 93     std::string title_line;
 94     getline(in, title_line);     // 跳过标题行
 95 
 96     member t;
 97     while (in  >> t)
 98         v.push_back(t);
 99 
100     in.close();
101 }
102 
103 
104 #include"member.hpp"
105 #include"tool.hpp"
106 #include <iostream>
107 #include <vector>
108 #include <algorithm>
109 
110 void test() {
111     using namespace std;
112     vector<member> v;
113     load("data5.txt", v);
114     sort(v.begin(), v.end(), compare);
115     output(cout, v);  
116     save("ans2.txt", v); 
117 }
118 int main() {
119     test();
120 }
View Code

（2）运行结果：

 

 

 

 

 

 

 

 

 

 

 

 

 

  1 #pragma once
  2 #include<iostream>
  3 #include<iomanip>
  4 #include<string>
  5 
  6 using std::string;
  7 using std::ostream;
  8 using std::istream;
  9 using std::setw;
 10 using std::ios_base;
 11 using std::setiosflags;
 12 
 13 class member {
 14 public:
 15     member() = default;
 16     ~member() = default;
 17     string get_course()const {
 18         return course;
 19     }
 20 
 21     int get_score()const {
 22         return score;
 23     }
 24 
 25     friend ostream& operator << (ostream & out, const member & m);
 26     friend istream& operator >> (istream& in, member& m);
 27 private:
 28     string number;
 29     string name;
 30     string course;
 31     int score;
 32 };
 33 
 34 ostream& operator << (ostream& out, const member& m) {
 35     out << setiosflags(ios_base::left);
 36     out << setw(15) << m.number
 37         << setw(15) << m.name
 38         << setw(15) << m.course
 39         << setw(5) << m.score;
 40 
 41     return out;
 42 }
 43 
 44 istream& operator >> (istream& in, member& m) {
 45     in >> m.number >> m.name >> m.course >> m.score;
 46     return in;
 47 }
 48 #include"member.hpp"
 49 #include<vector>
 50 #include<iostream>
 51 #include<fstream>
 52 #include<string>
 53 #include<vector>
 54 
 55 bool compare(const member& m1, const member& m2) {
 56     if (m1.get_course() < m2.get_course())
 57         return true;
 58     if (m1.get_course() == m2.get_course())
 59         return m1.get_score()>m2.get_score();
 60     return false;
 61 }
 62 
 63 void output(ostream& out,const std::vector<member>& v) {
 64     for (auto& i : v) {
 65         out << i << std::endl;
 66     }
 67 }
 68 
 69 void save(const std::string& filename, std::vector<member>& v) {
 70     using std::ofstream;
 71 
 72     ofstream out(filename);
 73     if (!out.is_open()) {
 74         std::cout << "fail to open file to write\n";
 75         return;
 76     }
 77 
 78     output(out, v);
 79     out.close();
 80 }
 81 
 82 void load(const std::string& filename, std::vector<member>& v) {
 83     using std::ifstream;
 84 
 85     ifstream in(filename);
 86     if (!in.is_open()) {
 87         std::cout << "fail to open file to read\n";
 88         return;
 89     }
 90 
 91     std::string title_line;
 92     getline(in, title_line);     // 跳过标题行
 93 
 94     member t;
 95     while (in  >> t)
 96         v.push_back(t);
 97 
 98     in.close();
 99 }
100 
101 
102 #include"member.hpp"
103 #include"tool.hpp"
104 #include <iostream>
105 #include <vector>
106 #include <algorithm>
107 
108 void test() {
109     using namespace std;
110     vector<member> v;
111     load("data5.txt", v);
112     sort(v.begin(), v.end(), compare);
113     output(cout, v);  
114     save("ans2.txt", v); 
115 }
116 int main() {
117     test();
118 }
View Code

 

posted @ 2024-12-17 18:40  刘晔yyy  阅读(24)  评论(0)    收藏  举报