C语言项目：学生成绩管理系统
1、数据结构：学生信息：学号、姓名、年龄、性别、3课成绩
2、功能：
（1）增加学生记录
(2) 删除学生记录
(3) 查找学生信息(学号、姓名)
(4) 修改学生信息
（5）按照成绩排序、求平均值、最大值、最小值
3、用户界面
主菜单
子菜单
4、 批量生成测试数据
1 // 2 // main.c 3 // Student System 4 // 5 // Created by ma c on 15/7/22. 6 // Copyright (c) 2015年. All rights reserved. 7 // 要求：编写一个学生成绩管理系统。 8 9 #include <stdio.h> 10 #include<string.h> 11 #include<stdlib.h> 12 #define N 50 13 struct Student{ 14 char name[20]; 15 int sno; 16 int age; 17 char gender; 18 float EnglishScore; 19 float mathScore; 20 float chineseScore; 21 }stu[N]={{"zhao",1000,20,'M',98,99,97}, 22 {"zhao",1001,21,'F',97,96,95}, 23 {"qian",1002,23,'M',95,96,92}, 24 {"hong",1003,22,'F',91,93,97}, 25 {"zhou",1004,25,'M',90,90,90}, 26 {"feng",1005,21,'F',96,93,96}, 27 {"wang",1006,23,'M',97,91,90}, 28 {"chen",1007,21,'F',94,92,91}, 29 {"geng",1008,20,'F',90,99,91}, 30 {"tang",1009,24,'M',99,99,99}}; 31 32 //添加数据 33 void add(struct Student stu[],int pos,int nums); 34 35 36 //删除数据 37 void Delete_name(struct Student *stu,char Name[]);//(按姓名) 38 void Delete_sno(struct Student *stu,int Sno);//(按学号) 39 40 41 //修改数据 42 void update(struct Student stu[],int Sno,int len); 43 44 45 //查询子菜单 46 void menu(struct Student stu[],int m); 47 void search(struct Student stu[],int n,char Name[]);//按姓名查询 48 void search1(struct Student stu[],int n,int Num);//按学号查询 49 void sort(struct Student stu[],int n); //按总分高低排序 50 void print(struct Student stu[],int n); 51 void My_print_sum(struct Student stu[],int n); 52 void max_min(struct Student stu[],int n); 53 54 55 //主菜单 56 void PrintScreen() 57 { 58 printf("------------------\n"); 59 printf("** 1.增加学生记录 **\n"); 60 printf("** 2.删除学生记录 **\n"); 61 printf("** 3.查找学生记录 **\n"); 62 printf("** 4.修改学生记录 **\n"); 63 printf("** 0.退出管理系统 **\n"); 64 printf("------------------\n"); 65 } 66 67 //删除子菜单 68 void deleteScreen() 69 { 70 printf("------------------\n"); 71 printf("** 0.按姓名删除数据**\n"); 72 printf("** 1.按学号删除数据**\n"); 73 printf("** 2.返回主菜单 **\n"); 74 printf("------------------\n"); 75 printf("please select 0-1:"); 76 } 77 78 //查找子菜单 79 void seekScreen() 80 { 81 printf("-------------------------\n"); 82 printf("****** 1.按姓名查找信息 *\n"); 83 printf("****** 2.按学号查找信息 *\n"); 84 printf("****** 3.查看所有学生成绩 *\n"); 85 printf("****** 4.成绩名次排序(总分)*\n"); 86 printf("****** 5.查看成绩最优最差 *\n"); 87 printf("****** 6.返回主菜单 *\n"); 88 printf("-------------------------\n"); 89 printf("please you select 1-6:"); 90 } 91 92 //定义全局静态变量,统计目前结构体数组中的人数 93 static int count = 10; 94 95 96 97 98 //主函数 99 int main(int argc, const char * argv[]) 100 { 101 int nums,temp; 102 int snos; 103 char names[20]; 104 while(1) 105 { 106 PrintScreen(); 107 printf("please press enter_key continue!\n"); 108 getchar(); 109 printf("please select 0-4:"); 110 char c = getchar(); 111 switch(c) 112 { 113 case '1': 114 printf("please student'numbers you want to add:"); 115 scanf("%d",&nums); 116 add(stu,count,nums); //添加数据 117 getchar(); 118 break; 119 case '2': 120 deleteScreen(); 121 scanf("%d",&temp); 122 switch(temp) 123 { 124 case 0: 125 printf("please input delete name:"); 126 scanf("%s",names);; 127 Delete_name(stu,names); //删除数据(按姓名删除) 128 break; 129 case 1: 130 printf("please input delete sno:"); 131 scanf("%d",&snos); 132 Delete_sno(stu,snos); //删除数据(按学号删除) 133 break; 134 case 2: 135 break; 136 } 137 getchar(); 138 break; 139 case '3': 140 menu(stu,count);//查找数据 141 getchar(); 142 break; 143 case '4': 144 printf("please input update sno:"); 145 scanf("%d",&snos); 146 update(stu,snos,count); //修改数据 147 break; 148 case '0': 149 exit(0); //退出系统 150 default: 151 printf("data is illeagel!\n"); 152 getchar(); 153 break; //输入非法 154 } 155 } 156 return 0; 157 } 158 159 160 161 //添加数据 162 void add(struct Student stu[],int pos,int nums)//开始位置、添加人数 163 { 164 for(int i=pos;i<pos+nums;i++) 165 { 166 printf("please input name:"); 167 scanf("%s",stu[i].name); 168 int flag = 1,sno; 169 while(flag) 170 { 171 printf("please input sno:"); 172 scanf("%d",&sno); 173 for(int j=0;j<pos;j++) 174 { 175 if(stu[j].sno==sno) 176 { 177 printf("sno is exist!\n"); 178 break; 179 } 180 else 181 { 182 flag = 0; 183 } 184 } 185 stu[i].sno = sno; 186 } 187 printf("please input age:"); 188 scanf("%d",&stu[i].age); 189 printf("please input gender:(f/m or F/M)"); 190 getchar(); 191 scanf("%c",&stu[i].gender); 192 printf("please input EnglishScore:"); 193 scanf("%f",&stu[i].EnglishScore); 194 printf("please input mathScore:"); 195 scanf("%f",&stu[i].mathScore); 196 printf("please input ChineseScore:"); 197 scanf("%f",&stu[i].chineseScore); 198 printf("学生信息添加成功!\n"); 199 } 200 count = count + nums; 201 } 202 203 //按学号删除 204 void Delete_sno(struct Student *stu,int Sno) 205 { 206 if(count==0) 207 { 208 printf("成员已为空!\n"); 209 return; 210 } 211 int flag=0; 212 for(int i=0;i<count;i++) 213 { 214 if((stu+i)->sno==Sno) 215 { 216 for(int j=i;j<count;j++) 217 { 218 *(stu+j)=*(stu+j+1); 219 } 220 printf("\n"); 221 printf("学号为%d的学生已被删除\n",Sno); 222 printf("\n"); 223 flag=1; 224 count = count-1; 225 break; 226 } 227 } 228 if(flag==0) 229 printf("学号%d不存在.\n",Sno); 230 } 231 232 //按姓名删除 233 void Delete_name(struct Student *stu,char Name[]) 234 { 235 if(count==0) 236 { 237 printf("成员已为空!\n"); 238 return; 239 } 240 int flag=0; 241 int n=count; 242 for(int i=0;i<n;i++) 243 { 244 if(strcmp((stu+i-flag)->name,Name)==0) 245 { 246 for(int j=i-flag;j<count;j++) 247 { 248 *(stu+j)=*(stu+j+1); 249 } 250 printf("\n"); 251 printf("学生:%s 已被删除.\n",Name); 252 printf("\n"); 253 flag=flag+1; 254 count =count -1; 255 } 256 } 257 if(flag==0) 258 printf("学生:%s 不存在.\n",Name); 259 } 260 261 //修改数据 262 void update(struct Student stu[],int sno,int len) 263 { 264 char cs,cs1,cs2,cs3; 265 char p[20]; 266 int grade,i; 267 for(i=0; i<len; i++) 268 { 269 if(sno==stu[i].sno) 270 { 271 printf("please ask update name?(y/n):"); 272 getchar(); 273 cs = getchar(); 274 if(cs == 'y') 275 { 276 printf("please input a new name:"); 277 scanf("%s",p); 278 getchar(); 279 strcpy(stu[i].name,p); 280 printf("update is succeed!\n"); 281 } 282 283 printf("please ask update EnglishScore?(y/n):"); 284 cs1 = getchar(); 285 if(cs1 == 'y') 286 { 287 printf("please input a new grade:"); 288 scanf("%d",&grade); 289 stu[i].EnglishScore = grade; 290 printf("update is succeed!\n"); 291 } 292 293 printf("please ask update mathScore?(y/n):"); 294 getchar(); 295 cs2 = getchar(); 296 if(cs2 == 'y') 297 { 298 printf("please input a new grade:"); 299 scanf("%d",&grade); 300 stu[i].mathScore = grade; 301 printf("update is succeed!\n"); 302 } 303 304 printf("please ask update chineseScore?(y/n):"); 305 getchar(); 306 cs3 = getchar(); 307 if(cs3 == 'y') 308 { 309 printf("please input a new grade:"); 310 scanf("%d",&grade); 311 stu[i].chineseScore = grade; 312 printf("update is succeed!\n"); 313 break; 314 } 315 else 316 { 317 getchar(); 318 break; 319 } 320 } 321 else if(i==len-1) 322 { 323 printf("error,don't have the sno!"); 324 break; 325 } 326 else 327 { 328 continue; 329 } 330 } 331 } 332 333 //查询数据 334 void menu(struct Student stu[],int m) 335 { 336 int logel = 1; 337 while(logel) 338 { 339 seekScreen(); 340 int n; 341 scanf("%d",&n); 342 char name[20]; 343 int num; 344 switch(n) 345 { 346 case 1 : 347 printf("请输入同学的姓名: "); 348 scanf("%s",name); 349 search(stu,count,name); 350 break; 351 case 2 : 352 printf("\n请输入同学的学号: "); 353 scanf("%d",&num); 354 search1(stu,count,num); 355 break; 356 case 3: 357 print(stu,count); 358 break; 359 case 4: 360 sort(stu,count); 361 print(stu,count); 362 break; 363 case 5: 364 max_min(stu,count); 365 break; 366 case 6: 367 logel = 0; 368 break; 369 default: 370 logel = 0; 371 printf("输入数字有误!\n"); 372 break; 373 } 374 } 375 } 376 void search(struct Student stu[],int n,char Name[]) 377 { 378 char* p= Name; 379 int flag = 0; 380 for(int i=0;i<n;i++) 381 { 382 if(strcmp(stu[i].name,p)==0) 383 { 384 flag = 1; 385 My_print_sum(stu,i); 386 } 387 } 388 if(flag==0) 389 { 390 printf("the name is not exist!\n"); 391 } 392 } 393 void search1(struct Student stu[],int n,int Num) 394 { 395 int flag = 0; 396 for(int i=0;i<n;i++) 397 { 398 if(Num==stu[i].sno) 399 { 400 flag = 1; 401 My_print_sum(stu,i); 402 } 403 } 404 if(flag==0) 405 { 406 printf("the sno is not exist!\n"); 407 } 408 } 409 void sort(struct Student stu[],int n) 410 { 411 float sum[N]; 412 for(int i=0;i<n;i++) 413 { 414 sum[i]=stu[i].EnglishScore+stu[i].mathScore+stu[i].chineseScore; 415 } 416 for(int i=0;i<n-1;i++) 417 { 418 for(int j=0;j<n-1-i;j++) 419 { 420 if(sum[j]<sum[j+1]) 421 { 422 float temp1 = sum[j]; 423 sum[j] = sum[j+1]; 424 sum[j+1] = temp1; 425 426 struct Student temp; 427 temp=stu[j]; 428 stu[j]=stu[j+1]; 429 stu[j+1]=temp; 430 } 431 } 432 } 433 } 434 void max_min(struct Student stu[],int n) 435 { 436 sort(stu,n); 437 438 printf("成绩最优的同学:"); 439 My_print_sum(stu,0); 440 441 printf("成绩最差的同学:"); 442 My_print_sum(stu,n-1); 443 } 444 445 void print(struct Student stu[],int n) 446 { 447 for(int i=0;i<n;i++) 448 { 449 My_print_sum(stu,i); 450 } 451 } 452 453 void My_print_sum(struct Student stu[],int n) 454 { 455 printf("\n姓名:%s,学号:%d,年龄:%d,性别:%c,英语:%.2f,数学:%.2f,语文: %.2f,总分:%.2f\n", 456 stu[n].name,stu[n].sno,stu[n].age,stu[n].gender, 457 stu[n].EnglishScore,stu[n].mathScore,stu[n].chineseScore,(stu[n].EnglishScore+stu[n].mathScore+stu[n].chineseScore)); 458 }