EasyX界面学生选课

以下是一个简单的 EasyX 界面学生选课代码示例，可以作为学习和参考：

#include <graphics.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_STUDENT_NUM 100 // 最大学生数
#define MAX_COURSE_NUM 20 // 最大课程数

struct Student {
    char name[20]; // 学生姓名
    char id[20]; // 学生学号
    char course[10][20]; // 已选课程
    int course_num; // 已选课程数
};

struct Course {
    char name[20]; // 课程名称
    char id[20]; // 课程编号
    int capacity; // 课程容量
    int selected_num; // 已选人数
};

struct Student students[MAX_STUDENT_NUM]; // 学生数组
int student_num = 0; // 学生数
struct Course courses[MAX_COURSE_NUM]; // 课程数组
int course_num = 0; // 课程数

void load_data() {
    FILE *fp;
    fp = fopen("data.txt", "r");
    if (fp == NULL) {
        return;
    }

    char buf[1024];
    while (fgets(buf, 1024, fp) != NULL) {
        if (buf[strlen(buf) - 1] == '\n') {
            buf[strlen(buf) - 1] = '\0';
        }
        char *p = strtok(buf, ",");
        if (strcmp(p, "student") == 0) {
            struct Student s;
            strcpy_s(s.name, p = strtok(NULL, ","));
            strcpy_s(s.id, p = strtok(NULL, ","));
            s.course_num = 0;
            while ((p = strtok(NULL, ",")) != NULL) {
                strcpy_s(s.course[s.course_num++], p);
            }
            students[student_num++] = s;
        } else if (strcmp(p, "course") == 0) {
            struct Course c;
            strcpy_s(c.name, p = strtok(NULL, ","));
            strcpy_s(c.id, p = strtok(NULL, ","));
            c.capacity = atoi(p = strtok(NULL, ","));
            c.selected_num = atoi(p = strtok(NULL, ","));
            courses[course_num++] = c;
        }
    }

    fclose(fp);
}

void save_data() {
    FILE *fp;
    fp = fopen("data.txt", "w");
    if (fp == NULL) {
        return;
    }

    for (int i = 0; i < student_num; i++) {
        fprintf(fp, "student,%s,%s", students[i].name, students[i].id);
        for (int j = 0; j < students[i].course_num; j++) {
            fprintf(fp, ",%s", students[i].course[j]);
        }
        fprintf(fp, "\n");
    }

    for (int i = 0; i < course_num; i++) {
        fprintf(fp, "course,%s,%s,%d,%d\n", courses[i].name, courses[i].id, courses[i].capacity, courses[i].selected_num);
    }

    fclose(fp);
}

void add_student() {
    if (student_num >= MAX_STUDENT_NUM) {
        return;
    }

    cleardevice();
    settextcolor(WHITE);
    outtextxy(100, 100, "请输入学生姓名：");
    char name[20];
    memset(name, 0, sizeof(name));
    inputbox_getline(100, 130, 300, 160, name, sizeof(name));
    outtextxy(100, 200, "请输入学生学号：");
    char id[20];
    memset(id, 0, sizeof(id));
    inputbox_getline(100, 230, 300, 260, id, sizeof(id));
    struct Student s;
    strcpy_s(s.name, name);
    strcpy_s(s.id, id);
    s.course_num = 0;
    students[student_num++] = s;
    save_data();
}

void add_course() {
    if (course_num >= MAX_COURSE_NUM) {
        return;
    }

    cleardevice();
    settextcolor(WHITE);
    outtextxy(100, 100, "请输入课程名称：");
    char name[20];
    memset(name, 0, sizeof(name));
    inputbox_getline(100, 130, 300, 160, name, sizeof(name));
    outtextxy(100, 200, "请输入课程编号：");
    char id[20];
    memset(id, 0, sizeof(id));
    inputbox_getline(100, 230, 300, 260, id, sizeof(id));
    outtextxy(100, 300, "请输入课程容量：");
    char capacity[10];
    memset(capacity, 0, sizeof(capacity));
    inputbox_getline(100, 330, 300, 360, capacity, sizeof(capacity));
    struct Course c;
    strcpy_s(c.name, name);
    strcpy_s(c.id, id);
    c.capacity = atoi(capacity);
    c.selected_num = 0;
    courses[course_num++] = c;
    save_data();
}

void select_course() {
    cleardevice();
    settextcolor(WHITE);
    outtextxy(100, 100, "请输入学生学号：");
    char id[20];
    memset(id, 0, sizeof(id));
    inputbox_getline(100, 130, 300, 160, id, sizeof(id));
    int i;
    for (i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            break;
        }
    }
    if (i >= student_num) {
        return;
    }

    int x = 100, y = 200;
    for (int j = 0; j < course_num; j++) {
        char buf[1024];
        sprintf_s(buf, "%s (%d/%d)", courses[j].name, courses[j].selected_num, courses[j].capacity);
        settextcolor(WHITE);
        outtextxy(x, y, buf);
        if (courses[j].selected_num >= courses[j].capacity) {
            settextcolor(GRAY);
            outtextxy(x + 200, y, "已满");
        } else {
            settextcolor(WHITE);
            outtextxy(x + 200, y, "未选");
            if (mousex() >= x && mousex() <= x + 200 && mousey() >= y && mousey() <= y + 20 && GetMouseButtons() == MOUSE_LEFTBUTTON) {
                strcpy_s(students[i].course[students[i].course_num++], courses[j].id);
                courses[j].selected_num++;
                save_data();
            }
        }
        y += 30;
    }
}

void show_selected_courses() {
    cleardevice();
    settextcolor(WHITE);
    outtextxy(100, 100, "请输入学生学号：");
    char id[20];
    memset(id, 0, sizeof(id));
    inputbox_getline(100, 130, 300, 160, id, sizeof(id));
    int i;
    for (i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            break;
        }
    }
    if (i >= student_num) {
        return;
    }

    int x = 100, y = 200;
    for (int j = 0; j < students[i].course_num; j++) {
        settextcolor(WHITE);
        outtextxy(x, y, students[i].course[j]);
        y += 30;
    }
}

int main()
{
    // 初始化图形界面
    initgraph(640, 480);
    
    // 设置字体
    LOGFONT f;
    ZeroMemory(&f, sizeof(LOGFONT));
    f.lfHeight = 24;
    strcpy_s(f.lfFaceName, LF_FACESIZE, "微软雅黑");
    HFONT hFont = CreateFontIndirect(&f);
    SelectObject(GetImageHDC(), hFont);

    // 加载数据
    load_data();

    // 绘制标题
    setbkmode(TRANSPARENT);
    settextcolor(WHITE);
    outtextxy(200, 100, "学生选课管理系统");

    // 绘制菜单
    RECT rcMenu = {200, 200, 400, 300};
    setfillcolor(DARKGRAY);
    fillrectangle(&rcMenu);
    settextcolor(BLACK);
    outtextxy(220, 220, "1. 学生信息管理");
    outtextxy(220, 240, "2. 课程信息管理");
    outtextxy(220, 260, "3. 选课");
    outtextxy(220, 280, "4. 已选课程");

    // 等待用户输入
    while (1)
    {
        if (GetMouseButtons() == MOUSE_LEFTBUTTON) {
            if (mousex() >= 200 && mousex() <= 400 && mousey() >= 200 && mousey() <= 220) {
                add_student();
            } else if (mousex() >= 200 && mousex() <= 400 && mousey() >= 240 && mousey() <= 260) {
                add_course();
            } else if (mousex() >= 200 && mousex() <= 400 && mousey() >= 260 && mousey() <= 280) {
                select_course();
            } else if (mousex() >= 200 && mousex() <= 400 && mousey() >= 280 && mousey() <= 300) {
                show_selected_courses();
            }
        }
        Sleep(10);
    }

    // 关闭图形界面
    closegraph();

    return 0;
}

这段代码实现了以下功能：

1. 加载数据；
2. 绘制标题和菜单；
3. 实现学生信息管理；
4. 实现课程信息管理；
5. 实现选课功能；
6. 实现已选课程功能。

由于篇幅限制和代码复杂度，这段代码可能存在一些问题和不足，仅供参考。如果需要更加完整和稳定的选课管理系统，建议您进行详细的规划和开发。