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大作业：学生信息管理系统。。。

　　　　　　一个简单学生信息管理系统。

　　　功能：

　　　　　　1. 可以读写文件内容

　　　　　　2.可以显示学生信息（只写了id 　　name 　　chinese　　math 　　ave　　五项信息）

　　　　　　3.可以删除学生信息

　　　　　　4.可以添加学生信息

　　1.头文件

 1 #ifndef _HEAD_H_
 2 #define _HEAD_H_
 3 
 4 #include <stdio.h>
 5 #include <string.h>
 6 #include <stdlib.h>
 7 #include <errno.h>
 8 
 9 #define MAX_NAME 37
10 #define MAX 1024
11 #define MAX_DATA  51
12 
13 enum hex{show = 1, sort, add, my_delete, quite = 520};
14 
15 typedef struct students
16 {
17     char name[MAX_NAME];
18     int seg;
19     int id;
20     float chinese;
21     float math;
22     float ave;
23     struct students *next;
24 }stu_t;
25 
26 int read_file(stu_t *);
27 int write_file(stu_t *);
28 void show_student_data(stu_t *);
29 void sort_ave_data(stu_t *);
30 void add_student_data(stu_t *, int);
31 void delete_student_data(stu_t *);
32 
33 #endif

头文件

　　2.main函数

 1 //main.c
 2 #include "head.h"
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     stu_t *head;
 7     int choose_num = 0, add_num = 0;
 8 
 9     head = calloc(1, sizeof(stu_t));
10 
11     if(-1 == read_file(head)) {
12         printf("------------------------------------------------------------------------------
");
13         fprintf(stderr,"No File or File no data!
");
14         printf("------------------------------------------------------------------------------
");
15     }
16     else {
17         printf("Read success!
");
18         printf("---------------------------------Write_list_data------------------------------
");
19     }
20 
21     while(1)
22     {
23         printf("==============================================================================
");
24         printf("1.Display all student's info
"
25                 "2.Sort by average
"
26                 "3.Insert a new info
"
27                 "4.Delete a record
");
28         printf("==============================================================================
");
29         printf("PLease input your choice : ");
30         scanf("%d", &choose_num);
31         getchar();
32 
33         switch(choose_num)
34         {
35             case quite :
36                 if(-1 == write_file(head)) {
37                     printf("------------------------------------------------------------------------------
");
38                     fprintf(stderr, "Write_file fail %s : %d : %s.
", __FILE__, __LINE__, strerror(errno));
39                     printf("------------------------------------------------------------------------------
");
40                     return -1;
41                 }
42                 else if(0 == write_file(head)) {
43                     printf("------------------------------------------------------------------------------
");
44                     printf("Write_File success!

");
45                 }
46 
47                 printf("Good Lucky!
");
48                 printf("------------------------------------------------------------------------------
");
49 
50                 free(head);
51                 head = NULL;
52 
53                 return 0;
54                 break;
55 
56             case show :
57                 show_student_data(head);
58                 break;
59 
60             case sort :
61                 printf("--------------------------Before sort_data------------------------------------
");
62                 show_student_data(head);
63                 printf("--------------------------Before sort_data------------------------------------

");
64                 sort_ave_data(head);
65                 printf("--------------------------After sort_data-------------------------------------
");
66                 show_student_data(head);
67                 printf("--------------------------After sort_data-------------------------------------

");
68                 break;
69 
70             case add :
71                 printf("Enter the student_num : ");
72                 scanf("%d", &add_num);
73                 getchar();
74 
75                 add_student_data(head, add_num);
76                 printf("--------------------------After add_data--------------------------------------
");
77                 show_student_data(head);
78                 printf("--------------------------After add_data--------------------------------------
");
79 
80                 break;
81 
82             case my_delete :
83                 printf("--------------------------Before add_data-------------------------------------
");
84                 show_student_data(head);
85                 printf("--------------------------Before  add_data------------------------------------

");
86                 printf("------------------------------------------------------------------------------
");
87                 delete_student_data(head);
88                 break;
89 
90             default :
91                 printf("------------------------------------------------------------------------------
");
92                 printf("Enter error.......
");
93                 printf("------------------------------------------------------------------------------
");
94                 break;
95         }
96     }
97 
98     return 0;
99 }

main

　　3.文件操作

 1 //file.c
 2 #include "head.h"
 3 
 4 int read_file(stu_t *read_head)
 5 {
 6     FILE *fp_read;
 7     char buffer[MAX], itemp_data[MAX_DATA];
 8     stu_t *data, *itemp_head;
 9     int number = 0;
10 
11     if(NULL == (fp_read = fopen("student_data.txt", "r"))) {
12         return -1;
13     }
14  
15     itemp_head = read_head;
16     while(fgets(buffer, MAX, fp_read) != NULL) 
17     {
18         number ++;
19         data = calloc(1, sizeof(stu_t));
20 
21         data->seg = number;
22 
23         strcpy(itemp_data, strtok(buffer, " "));
24         data->id = atoi(itemp_data);
25 
26         strcpy(itemp_data, strtok(NULL, " "));
27         strcpy(data->name, itemp_data);
28 
29         strcpy(itemp_data, strtok(NULL, " "));
30         data->chinese = atof(itemp_data);
31 
32         strcpy(itemp_data, strtok(NULL, " "));
33         data->math = atof(itemp_data);
34 
35         strcpy(itemp_data, strtok(NULL, " 
"));
36         data->ave = atof(itemp_data);
37 
38         itemp_head->next = data;
39         data->next = NULL;
40         itemp_head = data;
41     }
42 
43     printf("---------------------------------Write_list_data------------------------------
");
44     printf("Totai student_data is %d

", number);
45     return 0;
46 }
47 
48 int write_file(stu_t *write_head)
49 {
50     FILE *fp_write;
51     stu_t *itemp_head, *delete;
52 
53     if(NULL == (fp_write = fopen("student_data.txt", "w"))) {
54         fprintf(stderr, "Error fo fopen %s : %d : %s.
", __FILE__, __LINE__, strerror(errno));
55         return -1;
56     }
57 
58     itemp_head = write_head;
59     for( ; itemp_head->next; )
60     {
61         delete = itemp_head->next;
62         fprintf(fp_write, "%d %s %.1f %.1f %.1f
", itemp_head->next->id, itemp_head->next->name, itemp_head->next->chinese, itemp_head->next->math, itemp_head->next->ave);
63         itemp_head->next = itemp_head->next->next;
64         free(delete);
65     }
66 
67     return 0;
68 }

文件操作

　　4.链表操作（使用的单链表）

  1 //list.c
  2 #include "head.h"
  3 
  4 void show_student_data(stu_t *show_head)
  5 {
  6     stu_t *itemp_head;
  7 
  8     if(NULL == show_head->next) {
  9         printf("------------------------------------------------------------------------------
");
 10         printf("The list is no data to show!
");
 11         printf("------------------------------------------------------------------------------
");
 12         return ;
 13     }
 14 
 15     printf("
--------------------------Show data-----------------------------------------
");
 16     printf("seg	ID		NAME		CHINESE	MATH	AVERAGE
");
 17     itemp_head = show_head;
 18     for(; itemp_head->next; itemp_head = itemp_head->next)
 19     {
 20         printf("%d: 	%d		%s		%.1f	%.1f	%.1f
", itemp_head->next->seg, itemp_head->next->id, itemp_head->next->name, itemp_head->next->chinese, itemp_head->next->math, itemp_head->next->ave);
 21     }
 22     printf("
--------------------------Show data-----------------------------------------

");
 23 
 24     return ;
 25 }
 26 
 27 void sort_ave_data(stu_t *sort_head)
 28 {
 29     stu_t *itemp_head , *sort_1, *sort_2;
 30 
 31     int change_id = 0;
 32     char change_name[MAX_NAME];
 33     float change_number = 0.0;
 34 
 35     itemp_head = sort_head;
 36     if(NULL == itemp_head->next) {
 37         printf("------------------------------------------------------------------------------
");
 38         printf("The list no data to sort!
");
 39         printf("------------------------------------------------------------------------------
");
 40         return ;
 41     }
 42 
 43     for(sort_1 = itemp_head->next;  sort_1; sort_1 = sort_1->next)
 44     {
 45         for(sort_2 = sort_1->next; sort_2; sort_2 = sort_2->next)
 46         {
 47             if(sort_1->ave > sort_2->ave) {
 48 
 49                 change_id = sort_1->id;
 50                 sort_1->id = sort_2->id;
 51                 sort_2->id = change_id;
 52 
 53                 change_number = sort_1->chinese;
 54                 sort_1->chinese = sort_2->chinese;
 55                 sort_2->chinese = change_number;
 56 
 57                 change_number = sort_1->math;
 58                 sort_1->math = sort_2->math;
 59                 sort_2->math = change_number;
 60 
 61                 change_number = sort_1->ave;
 62                 sort_1->ave = sort_2->ave;
 63                 sort_2->ave = change_number;
 64 
 65                 strcpy(change_name, sort_1->name);
 66                 strcpy(sort_1->name, sort_2->name);
 67                 strcpy(sort_2->name, change_name);
 68 
 69             }
 70         }
 71     }
 72 
 73     return ;
 74 }
 75 
 76 void add_student_data(stu_t *add_head, int add_number)
 77 {
 78     stu_t *itemp_head, *data, *end, *find, *find_1, *end_1;
 79     char buffer[MAX_DATA];
 80 
 81     int i = 0, number = 0;
 82 
 83     find_1 = add_head;
 84     if(find_1->next != NULL) {
 85         for( ; ; )
 86         {
 87             if(NULL == find_1->next) {
 88                 end_1 = find_1;
 89                 break;
 90             }
 91             find_1 = find_1->next;
 92         }
 93         number = end_1->seg;
 94     }
 95 
 96     printf("------------------------------------------------------------------------------
");
 97     printf("ID should more than %d.
", number);
 98     printf("------------------------------------------------------------------------------
");
 99 
100     number = 0;
101 
102     itemp_head = add_head;
103     for(i = 0; i != add_number; i ++)
104     {
105         data = calloc(1, sizeof(stu_t));
106 
107         printf("Enter id : ");
108         fgets(buffer, MAX_DATA, stdin);
109         if('
' == *(buffer + strlen(buffer) - 1)) {
110             *(buffer + strlen(buffer) - 1) = '';
111         }
112         data->id = atoi(buffer);
113 
114         printf("Enter name : ");
115         fgets(buffer, MAX_DATA, stdin);
116         if('
' == *(buffer + strlen(buffer) - 1)) {
117             *(buffer + strlen(buffer) - 1) = '';
118         }
119         strcpy(data->name, buffer);
120 
121         printf("Enter chinese_score : ");
122         fgets(buffer, MAX_DATA, stdin);
123         if('
' == *(buffer + strlen(buffer) - 1)) {
124             *(buffer + strlen(buffer) - 1) = '';
125         }
126         data->chinese = atof(buffer);
127 
128         printf("Enter math_score : ");
129         fgets(buffer, MAX_DATA, stdin);
130         if('
' == *(buffer + strlen(buffer) - 1)) {
131             *(buffer + strlen(buffer) - 1) = '';
132         }
133         data->math = atof(buffer);
134 
135         printf("Enter ave_score : ");
136         fgets(buffer, MAX_DATA, stdin);
137         if('
' == *(buffer + strlen(buffer) - 1)) {
138             *(buffer + strlen(buffer) - 1) = '';
139         }
140         data->ave = atof(buffer);
141 
142         if(NULL == (itemp_head->next)) {
143             number++;
144             data->seg = number;
145 
146             itemp_head->next = data;
147             data->next = NULL;
148             itemp_head = data;
149         }
150         else {
151             for(find = add_head; ; find = find->next)
152             {
153                 if(NULL == (find->next)) {
154                     end = find;
155                     break;
156                 }
157             }
158             number = end->seg;
159             data->seg = ++number;
160             end->next = data;
161             data->next = NULL;
162         }
163 
164     }
165     printf("------------------------------------------------------------------------------
");
166     printf("Write_List Success!
");
167     printf("------------------------------------------------------------------------------
");
168 
169     return ;
170 }
171 
172 void delete_student_data(stu_t *delete_head)
173 {
174     stu_t *id_head, *name_head, *delete, *end, *find, *mobile;
175     int choose_num = 0, delete_id = 0, flag = 0;
176     char buffer[MAX_NAME];
177     int number = 0;
178 
179     find = delete_head;
180     if(NULL == find->next) {
181         printf("------------------------------------------------------------------------------
");
182         printf("The list no data to delete!
");
183         printf("------------------------------------------------------------------------------
");
184         return ;
185     }
186     else {
187         for(; ;)
188         {
189             if(NULL == find->next) {
190                 end = find;
191                 break;
192             }
193             find = find->next;
194         }
195     }
196 
197     number = end->seg;
198 
199     while(1)
200     {
201         flag = 0;
202 
203         printf("==============================================================================
");
204         printf("Please choose the way :
");
205         printf("1.Delete by ID
"
206                 "2.Delete by name
");
207         printf("==============================================================================
");
208         printf("Your choose : ");
209         scanf("%d", &choose_num);
210         getchar();
211 
212         switch(choose_num)
213         {
214             case 520 :
215                 printf("------------------------After delete_data-------------------------------------
");
216                 show_student_data(delete_head);
217                 printf("------------------------After delete_data-------------------------------------

");
218                 printf("------------------------------------------------------------------------------
");
219                 printf("Delete_quite :: Good Lucky!
");
220                 printf("------------------------------------------------------------------------------
");
221                 return ;
222                 break;
223 
224             case 1 :
225                 printf("------------------------------------------------------------------------------
");
226                 printf("Your shoule choose the numbe included 1-%d: ", number);
227                 printf("------------------------------------------------------------------------------
");
228                 scanf("%d", &delete_id);
229                 getchar();
230 
231                 id_head = delete_head;
232                 for(; id_head->next; id_head = id_head->next)
233                 {
234                     if(delete_id == id_head->next->id) {
235                         delete = id_head->next;
236 
237                         mobile = id_head->next->next;
238                         for( ; mobile; mobile = mobile->next)
239                         {
240                             mobile->seg = mobile->seg - 1;
241                         }
242 
243                         id_head->next = id_head->next->next;
244                         free(delete);
245 
246                         flag = 1;
247                         break;
248                     }
249                 }
250                 if(0 == flag) {
251                     printf("------------------------------------------------------------------------------
");
252                     printf("No your want delete's id_data.
");
253                     printf("------------------------------------------------------------------------------
");
254                 }
255                 break;
256 
257             case 2 :
258                 printf("Enter Delete_name : ");
259                 fgets(buffer, MAX_NAME, stdin);
260                 if('
' == *(buffer + strlen(buffer) - 1)) {
261                     *(buffer + strlen(buffer) - 1) = '';
262                 }
263 
264                 name_head = delete_head;
265                 for(; name_head->next; name_head = name_head->next)
266                 {
267                     if(0 == strcmp(buffer, name_head->next->name)) {
268                         delete = name_head->next;
269 
270                         mobile = name_head->next->next;
271                         for( ; mobile; mobile = mobile->next)
272                         {
273                             mobile->seg = mobile->seg - 1;
274                         }
275 
276                         name_head->next = name_head->next->next;
277                         free(delete);
278 
279                         flag = 1;
280                         break;
281                     }
282                 }
283                 if(0 == flag) {
284                     printf("------------------------------------------------------------------------------
");
285                     printf("No your want delete's name_data.
");
286                     printf("------------------------------------------------------------------------------
");
287                 }
288                 break;
289         }
290         show_student_data(delete_head);
291     }
292 
293     return ;
294 }

List

　　　　　　终于改好了。。爽快。。。嘿嘿。

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　笨宝贝。想你！

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原文地址：https://www.cnblogs.com/cxw825873709/p/3274952.html

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大作业 ：学生信息管理系统。。。

大作业：学生信息管理系统。。。