在抖音发现有一个大一新生求期末作业，顺手做了一下（C语言学生考勤）

这三个要求很简单

但是这个考核，要求课程结束后，自动完成考核要求有点模糊

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

#include <stdio.h>
#include <string.h>
#define MAX_STUDENTS 10
#define MAX_CLASSES 4
#define MAX_NAME_LENGTH 50
 
typedef struct {
    char name[MAX_NAME_LENGTH];
    char gender[10];
    int studentID;
    int classID; // 班级ID
    int attendance; // 出勤次数
} Student;
 
Student classes[MAX_CLASSES][MAX_STUDENTS];
 
void loadStudents() {
    FILE *file = fopen("C:\\Users\\32761\\Desktop\\students.txt", "r");
    if (file == NULL) {
        // 如果文件不存在，创建一个空文件
        file = fopen("C:\\Users\\32761\\Desktop\\students.txt", "w");
        if (file == NULL) {
            perror("无法创建文件");
            return;
        }
        fclose(file);
        printf("文件不存在，已创建空文件。\n");
        return;
    }
 
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            // 使用宽度限定符防止缓冲区溢出
            if (fscanf(file, "%49s %9s %d %d %d", classes[i][j].name, classes[i][j].gender, &classes[i][j].studentID, &classes[i][j].classID, &classes[i][j].attendance) != 5) {
                // 遇到读取错误或文件结束，停止读取
                break;
            }
        }
        // 如果内层循环因为读取错误而跳出，则也应跳出外层循环
        if (feof(file)) {
            break;
        }
    }
    fclose(file);
}
 
void saveStudents() {
    FILE *file = fopen("C:\\Users\\32761\\Desktop\\students.txt", "w");
    if (file == NULL) {
        perror("无法打开或创建文件");
        return;
    }
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID != 0) {
                fprintf(file, "%s %s %d %d %d\n", classes[i][j].name, classes[i][j].gender, classes[i][j].studentID, classes[i][j].classID, classes[i][j].attendance);
            }
        }
    }
    fclose(file);
}
 
void addStudent() {
    int classID;
    printf("请输入班级ID（1-4）：");
    scanf("%d", &classID);
    getchar(); // 清除输入缓冲区中的换行符
    if (classID < 1 || classID > MAX_CLASSES) {
        printf("无效的班级ID。\n");
        return;
    }
    for (int j = 0; j < MAX_STUDENTS; j++) {
        if (classes[classID - 1][j].studentID == 0) {
            printf("请输入学生姓名、性别、学号：");
            scanf("%s %s %d", classes[classID - 1][j].name, classes[classID - 1][j].gender, &classes[classID - 1][j].studentID);
            getchar(); // 清除输入缓冲区中的换行符
            classes[classID - 1][j].classID = classID;
            classes[classID - 1][j].attendance = 0;
            printf("学生添加成功！\n");
            saveStudents(); // 保存到文件
            return;
        }
    }
    printf("班级已满，无法添加更多学生。\n");
}
 
void deleteStudentByID(int studentID) {
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID == studentID) {
                classes[i][j].studentID = 0; // 将学号设为0表示删除
                printf("学生删除成功！\n");
                saveStudents(); // 保存到文件
                return;
            }
        }
    }
    printf("未找到该学号的学生。\n");
}
 
void modifyStudentByID(int studentID) {
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID == studentID) {
                printf("请输入新的学生姓名、性别、学号、班级ID：");
                scanf("%s %s %d %d", classes[i][j].name, classes[i][j].gender, &classes[i][j].studentID, &classes[i][j].classID);
                getchar(); // 清除输入缓冲区中的换行符
                printf("学生信息修改成功！\n");
                saveStudents(); // 保存到文件
                return;
            }
        }
    }
    printf("未找到该学号的学生。\n");
}
 
void queryStudentByID(int studentID) {
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID == studentID) {
                printf("姓名: %s, 性别: %s, 学号: %d, 班级ID: %d, 出勤次数: %d\n",
                       classes[i][j].name,
                       classes[i][j].gender,
                       classes[i][j].studentID,
                       classes[i][j].classID,
                       classes[i][j].attendance);
                return;
            }
        }
    }
    printf("未找到该学号的学生。\n");
}
 
void recordAttendanceByID(int studentID) {
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID == studentID) {
                classes[i][j].attendance++;
                printf("考勤记录成功！\n");
                saveStudents(); // 保存到文件
                return;
            }
        }
    }
    printf("未找到该学号的学生。\n");
}
 
void calculateScores() {
    FILE *file = fopen("C:\\Users\\32761\\Desktop\\scores.txt", "a");
    if (file == NULL) {
        printf("无法打开文件。\n");
        return;
    }
    for (int i = 0; i < MAX_CLASSES; i++) {
        for (int j = 0; j < MAX_STUDENTS; j++) {
            if (classes[i][j].studentID != 0) { // 只计算已存在的学生
                int score = classes[i][j].attendance * 10;
                printf("%s 的考核分数为：%d\n", classes[i][j].name, score);
                fprintf(file, "%s 的考核分数为：%d\n", classes[i][j].name, score);
            }
        }
    }
    fclose(file);
}
 
void menu() {
    printf("学生考勤系统\n");
    printf("1. 添加学生\n");
    printf("2. 删除学生（通过学号）\n");
    printf("3. 修改学生信息（通过学号）\n");
    printf("4. 查询学生信息（通过学号）\n");
    printf("5. 记录考勤（通过学号）\n");
    printf("6. 查看考核分数\n");
    printf("7. 退出\n");
}
 
int main() {
    loadStudents();
    int choice, studentID;
    while (1) {
        menu();
        printf("请选择操作：");
        scanf("%d", &choice);
        getchar(); // 清除输入缓冲区中的换行符
        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                printf("请输入学生学号：");
                scanf("%d", &studentID);
                getchar(); // 清除输入缓冲区中的换行符
                deleteStudentByID(studentID);
                break;
            case 3:
                printf("请输入学生学号：");
                scanf("%d", &studentID);
                getchar(); // 清除输入缓冲区中的换行符
                modifyStudentByID(studentID);
                break;
            case 4:
                printf("请输入学生学号：");
                scanf("%d", &studentID);
                getchar(); // 清除输入缓冲区中的换行符
                queryStudentByID(studentID);
                break;
            case 5:
                printf("请输入学生学号：");
                scanf("%d", &studentID);
                getchar(); // 清除输入缓冲区中的换行符
                recordAttendanceByID(studentID);
                break;
            case 6:
                calculateScores();
                break;
            case 7:
                saveStudents();
                printf("退出系统。\n");
                return 0;
            default:
                printf("无效的选择，请重试。\n");
        }
    }
}