又写了一个大一新生的期末作业(机房收费管理系统)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 | #include <stdio.h> #include <string.h> #include <math.h> // 定义学生结构体 struct Student { char id[20]; // 学号 char className[20]; // 班级 char name[20]; // 姓名 int startHour; // 上机开始时间(小时) int startMinute; // 上机开始时间(分钟) int endHour; // 下机时间(小时) int endMinute; // 下机时间(分钟) int isOnline; // 是否在线 double cost; // 费用 }; // 全局变量 struct Student students[30]; int studentCount = 0; const int MAX_STUDENTS = 30; // 函数声明 void inputStudent(); void calculateCost( int index); void searchStudent(); void displayComputerStatus(); double calculateTimeDifference( int startH, int startM, int endH, int endM); void showMenu(); void saveToFile(); void loadFromFile(); void saveStudentInfo( const char * filename); void loadStudentInfo( const char * filename); void saveComputerLog( const char * filename); void loadComputerLog( const char * filename); void initializeDefaultStudents(); // 定义文件名常量 #define STUDENT_FILE "student_info.txt" #define COMPUTER_LOG "computer_log.txt" int main() { loadFromFile(); // 程序启动时加载数据 int choice; while (1) { showMenu(); printf ( "请输入您的选择: " ); scanf ( "%d" , &choice); switch (choice) { case 1: inputStudent(); saveToFile(); // 添加学生后保存 break ; case 2: { int index; printf ( "请输入要结算的学生序号(0-%d): " , studentCount-1); scanf ( "%d" , &index); calculateCost(index); saveToFile(); // 计算费用后保存 break ; } case 3: searchStudent(); break ; case 4: displayComputerStatus(); break ; case 0: saveToFile(); // 退出前保存 printf ( "程序已退出!\n" ); return 0; default : printf ( "无效选择,请重试!\n" ); } } return 0; } void showMenu() { printf ( "\n====== 机房收费管理系统 ======\n" ); printf ( "1. 输入学生信息\n" ); printf ( "2. 计算上机费用\n" ); printf ( "3. 查询学生信息\n" ); printf ( "4. 显示机器使用情况\n" ); printf ( "0. 退出系统\n" ); printf ( "===========================\n" ); } void inputStudent() { if (studentCount >= MAX_STUDENTS) { printf ( "已达到最大学生数量!\n" ); return ; } printf ( "请输入学生信息:\n" ); printf ( "学号: " ); scanf ( "%s" , students[studentCount].id); printf ( "班级: " ); scanf ( "%s" , students[studentCount].className); printf ( "姓名: " ); scanf ( "%s" , students[studentCount].name); printf ( "上机时间(时 分): " ); scanf ( "%d %d" , &students[studentCount].startHour, &students[studentCount].startMinute); students[studentCount].isOnline = 1; students[studentCount].cost = 0; studentCount++; printf ( "学生信息录入成功!\n" ); } void calculateCost( int index) { if (index < 0 || index >= studentCount) { printf ( "无效的学生序号!\n" ); return ; } if (!students[index].isOnline) { printf ( "该学生已经下机!\n" ); return ; } printf ( "请输入下机时间(时 分): " ); scanf ( "%d %d" , &students[index].endHour, &students[index].endMinute); double hours = calculateTimeDifference( students[index].startHour, students[index].startMinute, students[index].endHour, students[index].endMinute ); students[index].cost = ceil (hours) * 1.0; students[index].isOnline = 0; printf ( "费用计算完成!\n" ); printf ( "学生: %s\n" , students[index].name); printf ( "上机时间: %.2f小时\n" , hours); printf ( "费用: %.2f元\n" , students[index].cost); } double calculateTimeDifference( int startH, int startM, int endH, int endM) { int totalMinutes = (endH * 60 + endM) - (startH * 60 + startM); return totalMinutes / 60.0; } void searchStudent() { printf ( "\n查询方式:\n" ); printf ( "1. 按班级查询\n" ); printf ( "2. 按学号查询\n" ); printf ( "3. 按姓名查询\n" ); int choice; char searchTerm[20]; printf ( "请选择查询方式: " ); scanf ( "%d" , &choice); printf ( "请输入查询关键字: " ); scanf ( "%s" , searchTerm); printf ( "\n查询结果:\n" ); printf ( "%-10s%-10s%-10s%-15s%-15s\n" , "学号" , "班级" , "姓名" , "状态" , "上机时间" ); for ( int i = 0; i < studentCount; i++) { int match = 0; switch (choice) { case 1: match = ( strcmp (students[i].className, searchTerm) == 0); break ; case 2: match = ( strcmp (students[i].id, searchTerm) == 0); break ; case 3: match = ( strcmp (students[i].name, searchTerm) == 0); break ; } if (match) { printf ( "%-10s%-10s%-10s%-15s%02d:%02d\n" , students[i].id, students[i].className, students[i].name, students[i].isOnline ? "在线" : "已下机" , students[i].startHour, students[i].startMinute); } } } void displayComputerStatus() { int online = 0; int offline = 0; for ( int i = 0; i < studentCount; i++) { if (students[i].isOnline) { online++; } else { offline++; } } printf ( "\n机器使用情况统计:\n" ); printf ( "总学生数:%d\n" , studentCount); printf ( "当前在线:%d\n" , online); printf ( "已经下机:%d\n" , offline); printf ( "\n使用情况图示:\n" ); printf ( "在线学生: " ); for ( int i = 0; i < online; i++) { printf ( "█" ); } printf ( " (%d)\n" , online); printf ( "离线学生: " ); for ( int i = 0; i < offline; i++) { printf ( "█" ); } printf ( " (%d)\n" , offline); } // 添加保存到文件的函数 void saveToFile() { // 保存学生基本信息 saveStudentInfo(STUDENT_FILE); // 保存上机记录 saveComputerLog(COMPUTER_LOG); } // 添加从文件加载的函数 void loadFromFile() { FILE *fp = fopen (STUDENT_FILE, "r" ); if (fp == NULL) { printf ( "首次运行,初始化30名学生信息...\n" ); initializeDefaultStudents(); saveToFile(); // 保存初始化的数据 return ; } fclose (fp); // 加载学生基本信息 loadStudentInfo(STUDENT_FILE); // 加载上机记录 loadComputerLog(COMPUTER_LOG); } // 保存学生基本信息(文本格式) void saveStudentInfo( const char * filename) { FILE *fp = fopen (filename, "w" ); if (fp == NULL) { printf ( "无法打开文件 %s!\n" , filename); return ; } fprintf (fp, "学生总数: %d\n" , studentCount); fprintf (fp, "学号\t班级\t姓名\t状态\t费用\n" ); for ( int i = 0; i < studentCount; i++) { fprintf (fp, "%s\t%s\t%s\t%s\t%.2f\n" , students[i].id, students[i].className, students[i].name, students[i].isOnline ? "在线" : "离线" , students[i].cost); } fclose (fp); printf ( "学生基本信息已保存到 %s\n" , filename); } // 加载学生基本信息(文本格式) void loadStudentInfo( const char * filename) { FILE *fp = fopen (filename, "r" ); if (fp == NULL) { printf ( "未找到文件 %s,将创建新文件。\n" , filename); return ; } char line[256]; // 跳过前两行(标题行) fgets (line, sizeof (line), fp); fgets (line, sizeof (line), fp); studentCount = 0; while ( fscanf (fp, "%s\t%s\t%s\t%s\t%lf\n" , students[studentCount].id, students[studentCount].className, students[studentCount].name, line, // 临时存储状态 &students[studentCount].cost) == 5) { students[studentCount].isOnline = ( strcmp (line, "在线" ) == 0); studentCount++; if (studentCount >= MAX_STUDENTS) break ; } fclose (fp); printf ( "已从 %s 加载 %d 条学生记录\n" , filename, studentCount); } // 保存上机记录(文本格式) void saveComputerLog( const char * filename) { FILE *fp = fopen (filename, "w" ); if (fp == NULL) { printf ( "无法打开文件 %s!\n" , filename); return ; } fprintf (fp, "上机记录\n" ); fprintf (fp, "学号\t开始时间\t结束时间\t费用\n" ); for ( int i = 0; i < studentCount; i++) { fprintf (fp, "%s\t%02d:%02d\t" , students[i].id, students[i].startHour, students[i].startMinute); if (!students[i].isOnline) { fprintf (fp, "%02d:%02d\t%.2f\n" , students[i].endHour, students[i].endMinute, students[i].cost); } else { fprintf (fp, "在线中\t0.00\n" ); } } fclose (fp); printf ( "上机记录已保存到 %s\n" , filename); } // 加载上机记录(文本格式) void loadComputerLog( const char * filename) { FILE *fp = fopen (filename, "r" ); if (fp == NULL) { printf ( "未找到文件 %s,将创建新文件。\n" , filename); return ; } char line[256]; // 跳过前两行(标题行) fgets (line, sizeof (line), fp); fgets (line, sizeof (line), fp); for ( int i = 0; i < studentCount; i++) { char status[20]; fscanf (fp, "%*s\t%d:%d\t%s" , &students[i].startHour, &students[i].startMinute, status); if ( strcmp (status, "在线中" ) == 0) { students[i].isOnline = 1; fscanf (fp, "%*f\n" ); } else { students[i].isOnline = 0; fscanf (fp, "%d:%d\t%lf\n" , &students[i].endHour, &students[i].endMinute, &students[i].cost); } } fclose (fp); printf ( "已从 %s 加载上机记录\n" , filename); } // 添加初始化学生信息的函数 void initializeDefaultStudents() { // 预设的班级列表 const char * classes[] = { "计算机1班" , "计算机2班" , "软件1班" , "软件2班" , "网络1班" }; studentCount = 30; // 设置为30名学生 for ( int i = 0; i < studentCount; i++) { // 生成学号 (例如: 2024001, 2024002, ...) sprintf (students[i].id, "2024%03d" , i + 1); // 分配班级 (循环使用预设的班级) strcpy (students[i].className, classes[i % 5]); // 生成姓名 (例如: 学生1, 学生2, ...) sprintf (students[i].name, "学生%d" , i + 1); // 设置上机时间 (8:00 到 17:00 之间随机分配) students[i].startHour = 8 + (i % 10); // 8:00 到 17:00 students[i].startMinute = (i * 2) % 60; // 0到58的偶数分钟 // 初始状态都设为在线 students[i].isOnline = 1; students[i].cost = 0.0; } printf ( "已初始化30名学生信息。\n" ); // 显示初始化的学生信息 printf ( "\n初始化的学生信息如下:\n" ); printf ( "%-10s%-15s%-10s%-15s\n" , "学号" , "班级" , "姓名" , "上机时间" ); printf ( "----------------------------------------\n" ); for ( int i = 0; i < studentCount; i++) { printf ( "%-10s%-15s%-10s%02d:%02d\n" , students[i].id, students[i].className, students[i].name, students[i].startHour, students[i].startMinute); } printf ( "----------------------------------------\n" ); } |
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