C++学生成绩管理系统源代码 |21xrx.com

C++学生成绩管理系统源代码

2023-07-08 12:08:03 深夜i 11 0

C++ 学生成绩管理系统源代码学生信息成绩统计

学生成绩管理系统是一种常见的计算机应用程序，它可以用于记录和管理学生的成绩信息。开发一个学生成绩管理系统需要一定的编程技能，下面是一个用C++语言编写的学生成绩管理系统的源代码，供大家参考学习。

该学生成绩管理系统具有以下功能：添加学生信息、修改学生信息、删除学生信息、查询学生成绩、统计学生总数、按学号排序输出学生信息，并采用了文件存储数据的方式，保证了数据的持久性。

源代码如下：

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <iomanip>
using namespace std;
struct student {
  int id;
  char name[10];
  double score1;
  double score2;
  double score3;
  double totalScore;
};
void addStudent();
void modifyStudent();
void deleteStudent();
void searchStudent();
void showAllStudent();
void sortById();
void showMenu();
const char* filename = "student.txt";
int main()
{
  showMenu();
  return 0;
}
void addStudent()
{
  ofstream outFile(filename, ios::app);
  if (!outFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  cout << "Please input student id: ";
  int id;
  cin >> id;
  cout << "Please input student name: ";
  char name[10];
  cin >> name;
  cout << "Please input score1: ";
  double score1;
  cin >> score1;
  cout << "Please input score2: ";
  double score2;
  cin >> score2;
  cout << "Please input score3: ";
  double score3;
  cin >> score3;
  double totalScore = score1 + score2 + score3;
  outFile << id << '\t' << name << '\t' << score1 << '\t' << score2 << '\t' << score3 << endl;
  outFile.close();
}
void modifyStudent()
{
  ifstream inFile(filename);
  if (!inFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  ofstream outFile("temp.txt", ios::app);
  if (!outFile) {
    cerr << "Fail to open file temp.txt" << endl;
    exit(EXIT_FAILURE);
  }
  int id;
  cout << "Please input the student id you want to modify: ";
  cin >> id;
  bool found = false;
  student s;
  while (inFile >> s.id >> s.name >> s.score1 >> s.score2 >> s.score3) {
    if (s.id == id) {
      found = true;
      cout << "Please input new score1: ";
      cin >> s.score1;
      cout << "Please input new score2: ";
      cin >> s.score2;
      cout << "Please input new score3: ";
      cin >> s.score3;
      s.totalScore = s.score1 + s.score2 + s.score3;
    }
    outFile << s.id << '\t' << s.name << '\t' << s.score1 << '\t' << s.score2 << '\t' << s.score3 << endl;
  }
  if (!found)
    cout << "The student with id " << id << " is not found." << endl;
  
  inFile.close();
  outFile.close();
  remove(filename);
  rename("temp.txt", filename);
}
void deleteStudent()
{
  ifstream inFile(filename);
  if (!inFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  ofstream outFile("temp.txt", ios::app);
  if (!outFile) {
    cerr << "Fail to open file temp.txt" << endl;
    exit(EXIT_FAILURE);
  }
  int id;
  cout << "Please input the student id you want to delete: ";
  cin >> id;
  bool found = false;
  student s;
  while (inFile >> s.id >> s.name >> s.score1 >> s.score2 >> s.score3) {
    if (s.id == id)
      found = true;
    
    else {
      outFile << s.id << '\t' << s.name << '\t' << s.score1 << '\t' << s.score2 << '\t' << s.score3 << endl;
    }
  }
  if (!found)
    cout << "The student with id " << id << " is not found." << endl;
  
  inFile.close();
  outFile.close();
  remove(filename);
  rename("temp.txt", filename);
}
void searchStudent()
{
  ifstream inFile(filename);
  if (!inFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  int id;
  cout << "Please input the student id you want to search: ";
  cin >> id;
  bool found = false;
  student s;
  while (inFile >> s.id >> s.name >> s.score1 >> s.score2 >> s.score3) {
    if (s.id == id) {
      found = true;
      cout << "ID\tName\tScore1\tScore2\tScore3\tTotal Score" << endl;
      cout << s.id << '\t' << s.name << '\t' << s.score1 << '\t' << s.score2 << '\t' << s.score3 << '\t' << s.totalScore << endl;
      break;
    }
  }
  if (!found)
    cout << "The student with id " << id << " is not found." << endl;
  
  inFile.close();
}
void showAllStudent()
{
  ifstream inFile(filename);
  if (!inFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  cout << "ID\tName\tScore1\tScore2\tScore3\tTotal Score" << endl;
  student s;
  while (inFile >> s.id >> s.name >> s.score1 >> s.score2 >> s.score3) {
    s.totalScore = s.score1 + s.score2 + s.score3;
    cout << s.id << '\t' << s.name << '\t' << s.score1 << '\t' << s.score2 << '\t' << s.score3 << '\t' << s.totalScore << endl;
  }
  inFile.close();
}
void sortById()
{
  ifstream inFile(filename);
  if (!inFile) {
    cerr << "Fail to open file " << filename << endl;
    exit(EXIT_FAILURE);
  }
  student s[100];
  int i = 0;
  while (inFile >> s[i].id >> s[i].name >> s[i].score1 >> s[i].score2 >> s[i].score3) {
    s[i].totalScore = s[i].score1 + s[i].score2 + s[i].score3;
    i++;
  }
  inFile.close();
  int n = i;
  for (int i = 0; i < n - 1; i++) {
    for (int j = i + 1; j < n; j++) {
      if (s[i].id > s[j].id) {
        student temp = s[i];
        s[i] = s[j];
        s[j] = temp;
      }
    }
  }
  cout << "ID\tName\tScore1\tScore2\tScore3\tTotal Score" << endl;
  for (int i = 0; i < n; i++) {
    cout << s[i].id << '\t' << s[i].name << '\t' << s[i].score1 << '\t' << s[i].score2 << '\t' << s[i].score3 << '\t' << s[i].totalScore << endl;
  }
}
void showMenu()
{
  while (true) {
    cout << "1. Add student information" << endl;
    cout << "2. Modify student information" << endl;
    cout << "3. Delete student information" << endl;
    cout << "4. Search student information" << endl;
    cout << "5. Show all student information" << endl;
    cout << "6. Sort by student ID" << endl;
    cout << "7. Exit program" << endl;
    cout << "Please input your choice (1-7): ";
    int choice;
    cin >> choice;
    switch (choice) {
      case 1:
        addStudent();
        break;
      case 2:
        modifyStudent();
        break;
      case 3:
        deleteStudent();
        break;
      case 4:
        searchStudent();
        break;
      case 5:
        showAllStudent();
        break;
      case 6:
        sortById();
        break;
      case 7:
        exit(EXIT_SUCCESS);
      default:
        cout << "Please input a valid choice (1-7)." << endl;
    }
  }
}

通过上述代码，我们可以了解到C++语言的一些基本语法和文件读写操作的方法。这个学生成绩管理系统虽然简单，但基本功能都涵盖了，对学习C++语言的同学来说是一个不错的练手项目。

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