程序设计实验6

实验任务1

 

实验任务2

实验任务3

实验任务4

#pragma once
#include<iostream>
#include<stdexcept>
#include<iomanip>
using namespace std;
template<typename T>
class Vector {
private:
int size;
T* ptr;
public:
Vector(int size, int value = 0) :size{ size } {
if (size < 0) {
throw length_error("negative size");
}
ptr = new T[size];
for (int i = 0; i < size; i++) {
ptr[i] = value;
}
}
int get_size()const { return size; }
T& at(int index)const {
if (index < 0 || index >= size) throw out_of_range("index out of range");
return ptr[index];
}
T& operator[](int index)const {
if (index < 0 || index >= size) throw out_of_range("index out of range");
return ptr[index];
}
};
template<typename T1>
void output(const Vector<T1>& v) {
for (int i = 0; i < v.get_size();i++) {
cout << v[i] <<", ";
}
cout << endl;
｝

实验任务5

#include<iostream>
  #include<fstream>
  #include<algorithm>
  #include<vector>
  #include<iomanip>
  #include<string>
  using namespace std;
  struct stu
  {
    string id;
    string name;
    string major;
    int score;   
    stu(string id,string name,string major,int score):id{id},name{name},major{major},score{score}{}
 };
 bool compare(stu x, stu y) {
     if(x.major!=y.major)
         return x.major < y.major;
     else{
         return x.score > y.score;
     }
 }
 int main() {
     ifstream input("data5.txt");
     if (!input.is_open()) {
         cout << "无法加载文件中的数据" << endl;
         return 0;
     }
     string id, name, major;
     int score;
     vector<stu> v;
     while (input >> id >> name >> major >> score) {
         v.push_back(stu(id, name, major, score));
     }
     input.close();
     sort(v.begin(), v.end(), compare);
     ofstream output("ans5.txt");
    if (!output.is_open()) {
         cout << "文件加载失败" << endl;
     }
     for (auto i : v) {
         cout << setiosflags(ios_base::left);
         cout << setw(10) << i.id << setw(10) << i.name << setw(10) << i.major << setw(10) << i.score << endl;
         output << i.id << "  " << i.name << "  " << i.major << "  " << i.score << endl;
     }
     output.close();
     return 0;
 }