实验六

task4

Vector.hpp

#pragma once
#ifndef VECTOR_HPP
#define VECTOR_HPP
 
#include <iostream>
#include <stdexcept> 
#include <memory>    
 
template <typename T>
class Vector {
private:
    std::unique_ptr<T[]> data; 
    int size; 
 
public:
    
    Vector(int n) : size(n) {
        if (n < 0) {
            throw std::length_error("Size cannot be negative.");
        }
        data = std::make_unique<T[]>(n); 
    }
 
   
    Vector(int n, T value) : size(n) {
        if (n < 0) {
            throw std::length_error("Size cannot be negative.");
        }
        data = std::make_unique<T[]>(n);
        for (int i = 0; i < n; ++i) {
            data[i] = value;
        }
    }
 
   
    Vector(const Vector<T>& other) : size(other.size) {
        data = std::make_unique<T[]>(size);
        for (int i = 0; i < size; ++i) {
            data[i] = other.data[i]; 
        }
    }
 
   
    int get_size() const {
        return size;
    }
 
    
    T& at(int index) {
        if (index < 0 || index >= size) {
            throw std::out_of_range("Index is out of range.");
        }
        return data[index];
    }
 
   
    T& operator[](int index) {
        if (index < 0 || index >= size) {
            throw std::out_of_range("Index is out of range.");
        }
        return data[index];
    }
 
    friend void output(const Vector<T>& vec) {
        for (int i = 0; i < vec.size; ++i) {
            std::cout << vec.data[i] << " ";
        }
        std::cout << std::endl;
    }
 
};

task4.cpp

#include <iostream>
#include "Vector.hpp"
 
void test1() {
    using namespace std;
    int n;
    cout << "Enter n: ";
    cin >> n;
 
    Vector<double> x1(n); 
    for (auto i = 0; i < n; ++i)
        x1.at(i) = i * 0.7; 
 
    cout << "x1: "; output(x1);
 
    Vector<int> x2(n, 42); 
    const Vector<int> x3(x2); 
 
    cout << "x2: "; output(x2);
    cout << "x3: "; output(x3);
 
    x2.at(0) = 77; 
    x2.at(1) = 777;
 
    cout << "x2: "; output(x2);
    cout << "x3: "; output(x3);
}
 
void test2() {
    using namespace std;
    int n, index;
    while (cout << "Enter n and index: ", cin >> n >> index) {
        try {
            Vector<int> v(n, n);
            v.at(index) = -999; 
            cout << "v: "; output(v);
        }
        catch (const exception& e) {
            cout << e.what() << endl; 
        }
    }
}
 
int main() {
    using namespace std;
    cout << "测试1: 模板类接口测试\n";
    test1();
 
    cout << "\n测试2: 模板类异常处理测试\n";
    test2();
 
    return 0;
}

 

task5

task5.cpp

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string>
 
using namespace std;
 
struct Student {
    int id;            // 学号
    string name;      // 姓名
    string major;     // 专业
    int score;        // 分数
 
    Student(int _id, string _name, string _major, int _score)
        : id(_id), name(_name), major(_major), score(_score) {}
};

bool compare(const Student& a, const Student& b) {
    if (a.major == b.major) {
        return a.score > b.score; 
    }
    return a.major < b.major; 
}
 

void processStudents(const string& inputFile, const string& outputFile) {
    vector<Student> students; 
 
    ifstream inFile(inputFile);
    if (!inFile) {
        cerr << "无法打开文件: " << inputFile << endl;
        return;
    }
 
    int id, score;
    string name, major;
 
    
    while (inFile >> id >> name >> major >> score) {
        students.emplace_back(id, name, major, score); 
    }
    inFile.close();
 
   
    sort(students.begin(), students.end(), compare);
 
    
    ofstream outFile(outputFile);
    if (!outFile) {
        cerr << "无法打开文件: " << outputFile << endl;
        return;
    }
 
    cout << "学号\t姓名\t专业\t分数" << endl; 
    outFile << "学号\t姓名\t专业\t分数" << endl; 
 
    for (const auto& student : students) {
        cout << student.id << "\t" << student.name << "\t"
            << student.major << "\t" << student.score << endl;
        outFile << student.id << "\t" << student.name << "\t"
            << student.major << "\t" << student.score << endl; 
    }
 
    outFile.close();
}
int main() {
    string inputFile = "data5.txt"; 
    string outputFile = "ans5.txt";   
 
    processStudents(inputFile, outputFile); 
 
    return 0;
}