c++easyx管理系统实例

以下是一个基于c++easyx的简单的管理系统实例：

#include <iostream>
#include <graphics.h>
#include <conio.h>
#include <fstream>
#include <string>
#include <cstring>

using namespace std;

//定义结构体
struct student
{
    int id;
    string name;
    float score;
};

//定义常量
const int MAX_STUDENT_NUM = 100;

//定义全局变量
int studentNum = 0;
student students[MAX_STUDENT_NUM];

//定义函数
void displayMainMenu();
void displayAddStudentMenu();
void displaySearchStudentMenu();
void displayListStudentsMenu();
void displayModifyStudentMenu();
void displayDeleteStudentMenu();

void addStudent(int id, string name, float score);
void searchStudentById(int id);
void searchStudentByName(string name);
void listStudents();
void modifyStudent(int id);
void deleteStudent(int id);

int main()
{
    //初始化窗口
    initgraph(640, 480);

    //显示主菜单
    displayMainMenu();

    //关闭窗口
    closegraph();

    return 0;
}

//显示主菜单
void displayMainMenu()
{
    cleardevice();

    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("1. 添加学生信息"));
    outtextxy(240, 140, _T("2. 查找学生信息"));
    outtextxy(240, 180, _T("3. 列出所有学生信息"));
    outtextxy(240, 220, _T("4. 修改学生信息"));
    outtextxy(240, 260, _T("5. 删除学生信息"));
    outtextxy(240, 300, _T("0. 退出系统"));

    char ch = _getch();

    switch (ch)
    {
    case '1':
        displayAddStudentMenu();
        break;
    case '2':
        displaySearchStudentMenu();
        break;
    case '3':
        displayListStudentsMenu();
        break;
    case '4':
        displayModifyStudentMenu();
        break;
    case '5':
        displayDeleteStudentMenu();
        break;
    case '0':
        return;
    default:
        displayMainMenu();
        break;
    }
}

//显示添加学生信息菜单
void displayAddStudentMenu()
{
    cleardevice();

    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("请输入学生信息："));

    int id;
    string name;
    float score;

    outtextxy(240, 140, _T("学号："));
    cin >> id;
    outtextxy(240, 180, _T("姓名："));
    cin >> name;
    outtextxy(240, 220, _T("成绩："));
    cin >> score;

    addStudent(id, name, score);

    outtextxy(240, 260, _T("添加成功！"));
    _getch();

    displayMainMenu();
}

//显示查找学生信息菜单
void displaySearchStudentMenu()
{
    cleardevice();

    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("请选择查找方式："));
    outtextxy(240, 140, _T("1. 按学号查找"));
    outtextxy(240, 180, _T("2. 按姓名查找"));
    outtextxy(240, 220, _T("0. 返回主菜单"));

    char ch = _getch();

    switch (ch)
    {
    case '1':
        cleardevice();
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 100, _T("请输入学号："));
        int id;
        cin >> id;
        searchStudentById(id);
        _getch();
        displaySearchStudentMenu();
        break;
    case '2':
        cleardevice();
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 100, _T("请输入姓名："));
        string name;
        cin >> name;
        searchStudentByName(name);
        _getch();
        displaySearchStudentMenu();
        break;
    case '0':
        displayMainMenu();
        break;
    default:
        displaySearchStudentMenu();
        break;
    }
}

//显示列出所有学生信息菜单
void displayListStudentsMenu()
{
    cleardevice();

    listStudents();

    _getch();

    displayMainMenu();
}

//显示修改学生信息菜单
void displayModifyStudentMenu()
{
    cleardevice();

    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("请输入要修改的学生学号："));
    int id;
    cin >> id;
    modifyStudent(id);

    _getch();

    displayMainMenu();
}

//显示删除学生信息菜单
void displayDeleteStudentMenu()
{
    cleardevice();

    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("请输入要删除的学生学号："));
    int id;
    cin >> id;
    deleteStudent(id);

    _getch();

    displayMainMenu();
}

//添加学生信息
void addStudent(int id, string name, float score)
{
    students[studentNum].id = id;
    students[studentNum].name = name;
    students[studentNum].score = score;

    studentNum++;

    //将学生信息保存到文件
    ofstream outFile("students.dat", ios::binary | ios::app);
    outFile.write((char*)&id, sizeof(id));
    outFile.write((char*)name.c_str(), name.length());
    outFile.write((char*)&score, sizeof(score));
    outFile.close();
}

//按学号查找学生信息
void searchStudentById(int id)
{
    bool found = false;

    for (int i = 0; i < studentNum; i++)
    {
        if (students[i].id == id)
        {
            settextstyle(20, 0, _T("宋体"));
            outtextxy(240, 140, _T("学号\t姓名\t成绩"));
            outtextxy(240, 180, to_string(students[i].id).c_str());
            outtextxy(300, 180, students[i].name.c_str());
            outtextxy(360, 180, to_string(students[i].score).c_str());
            found = true;
            break;
        }
    }

    if (!found)
    {
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 140, _T("查无此人！"));
    }
}

//按姓名查找学生信息
void searchStudentByName(string name)
{
    bool found = false;

    for (int i = 0; i < studentNum; i++)
    {
        if (students[i].name == name)
        {
            settextstyle(20, 0, _T("宋体"));
            outtextxy(240, 140, _T("学号\t姓名\t成绩"));
            outtextxy(240, 180, to_string(students[i].id).c_str());
            outtextxy(300, 180, students[i].name.c_str());
            outtextxy(360, 180, to_string(students[i].score).c_str());
            found = true;
        }
    }

    if (!found)
    {
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 140, _T("查无此人！"));
    }
}

//列出所有学生信息
void listStudents()
{
    settextstyle(20, 0, _T("宋体"));
    outtextxy(240, 100, _T("学号\t姓名\t成绩"));

    for (int i = 0; i < studentNum; i++)
    {
        outtextxy(240, 140 + i * 40, to_string(students[i].id).c_str());
        outtextxy(300, 140 + i * 40, students[i].name.c_str());
        outtextxy(360, 140 + i * 40, to_string(students[i].score).c_str());
    }
}

//修改学生信息
void modifyStudent(int id)
{
    bool found = false;

    for (int i = 0; i < studentNum; i++)
    {
        if (students[i].id == id)
        {
            settextstyle(20, 0, _T("宋体"));
            outtextxy(240, 140, _T("请输入新的学生信息："));

            int newId;
            string newName;
            float newScore;

            outtextxy(240, 180, _T("学号："));
            cin >> newId;
            outtextxy(240, 220, _T("姓名："));
            cin >> newName;
            outtextxy(240, 260, _T("成绩："));
            cin >> newScore;

            students[i].id = newId;
            students[i].name = newName;
            students[i].score = newScore;

            //将学生信息保存到文件
            ofstream outFile("students.dat", ios::binary | ios::trunc);
            for (int j = 0; j < studentNum; j++)
            {
                outFile.write((char*)&students[j].id, sizeof(students[j].id));
                outFile.write((char*)students[j].name.c_str(), students[j].name.length());
                outFile.write((char*)&students[j].score, sizeof(students[j].score));
            }
            outFile.close();

            found = true;
            break;
        }
    }

    if (!found)
    {
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 140, _T("查无此人！"));
    }
}

//删除学生信息
void deleteStudent(int id)
{
    bool found = false;

    for (int i = 0; i < studentNum; i++)
    {
        if (students[i].id == id)
        {
            found = true;

            //删除该学生信息
            for (int j = i; j < studentNum - 1; j++)
            {
                students[j] = students[j + 1];
            }
            studentNum--;

            //将学生信息保存到文件
            ofstream outFile("students.dat", ios::binary | ios::trunc);
            for (int j = 0; j < studentNum; j++)
            {
                outFile.write((char*)&students[j].id, sizeof(students[j].id));
                outFile.write((char*)students[j].name.c_str(), students[j].name.length());
                outFile.write((char*)&students[j].score, sizeof(students[j].score));
            }
            outFile.close();

            break;
        }
    }

    if (!found)
    {
        settextstyle(20, 0, _T("宋体"));
        outtextxy(240, 140, _T("查无此人！"));
    }
}

此例中，使用了c++easyx图形库来实现界面的绘制和用户交互，使用了文件来存储学生信息，具体实现可以参考代码注释。