多文件模块的学生信息库系统

student.h

 1 #include<stdio.h>
 2 #include<string.h>
 3 #define MaxSize 50
 4 struct student
 5 {
 6     int num;
 7     char name[10];
 8     int computer, english, math;
 9     double average;
10 };
11 void new_student(struct student students[]);
12 void output_student(struct student students[]);
13 void average(struct student students[]);
14 void sort(struct student students[]);
15 void modify(struct student students[]);
16 void search_student(struct student students[], int num);

main.c

 1 #include "student.h"
 2 int Count = 0;
 3 int main(void)
 4 {
 5     struct student students[MaxSize];
 6     new_student(students);
 7     average(students);
 8     printf("New\n");
 9     output_student(students);
10     sort(students);
11     printf("After Sort:\n");
12     output_student(students);
13     modify(students);
14     printf("After Modify:\n");
15     output_student(students);
16     int num;
17     printf("Enter num:");
18     scanf_s("%d", &num);
19     search_student(students, num);
20 
21     return 0;
22 }

input_output.c

 1 #include "student.h"
 2 
 3 extern Count;
 4 void new_student(struct student students[])
 5 {
 6     int i, n;
 7     if (Count == MaxSize)
 8     {
 9         printf("The array is full!\n");
10 
11         return;
12     }
13     printf("Input the Number of Students:");
14     scanf_s("%d", &n);
15     for (i = 0; i < n; i++)
16     {
17         printf("Input the student's num:");
18         scanf_s("%d", &students[i].num);
19         printf_s("Input the student's name:");
20         scanf_s("%s", students[i].name, 10);
21         printf("Input the student's math.score:");
22         scanf_s("%d", &students[i].math);
23         printf("Input the student's english.score:");
24         scanf_s("%d", &students[i].english);
25         printf("Input the student's computer.score:");
26         scanf_s("%d", &students[i].computer);
27 
28         Count++;
29     }
30 }
31 void output_student(struct student students[])
32 {
33     int i;
34     if (Count == 0)
35     {
36         printf("Count of students is zero!\n");
37         return;
38     }
39     printf("num\tname\tmath\tenglish\tcomputer\taverage\n");
40     for (i = 0; i < Count; i++)
41     {
42         printf("%d\t%s\t%d\t%d\t%d\t%f\n", students[i].num, students[i].name, students[i].math, students[i].english, students[i].computer, students[i].average);
43     }
44 }

aver_sort.c

 1 #include "student.h"
 2 extern Count;
 3 void average(struct student students[])
 4 {
 5     int i;
 6     for (i = 0; i < Count; i++)
 7     {
 8         students[i].average = 1.0 * (students[i].math + students[i].english + students[i].computer) / 3;
 9     }
10 }
11 void sort(struct student students[])
12 {
13     struct student temp;
14     int i, j, index;
15     for (i = 0; i < Count - 1; i++)
16     {
17         index = i;
18         for (j = i + 1; j < Count; j++)
19         {
20             if (students[j].average > students[index].average)
21             {
22                 index = j;
23             }
24         }
25         temp = students[i];
26         students[i] = students[index];
27         students[index] = temp;
28     }
29 }

modify.c

 1 #include "student.h"
 2 extern Count;
 3 void modify(struct student students[])
 4 {
 5     int num, course, score, i;
 6     struct student* p = students;
 7     printf("Input the number of the students to be updated:");
 8     scanf_s("%d", &num);
 9     printf("Choice the course:1.math 2.english 3.computer:");
10     scanf_s("%d", &course);
11     printf("Input the new score:");
12     scanf_s("%d", &score);
13     for (i = 0; i < Count; i++, p++)
14     {
15         if (p->num == num)
16         {
17             break;
18         }
19     }
20     if (i < Count)
21     {
22         switch (course)
23         {
24         case 1:p->math = score; break;
25         case 2:p->english = score; break;
26         case 3:p->computer = score; break;
27         }
28     }
29 }
30 void search_student(struct student students[], int num)
31 {
32     int i, flag = 0;
33     if (Count == 0)
34     {
35         printf("Count of students is zero!\n");
36         return;
37     }
38     for (i = 0; i < Count; i++)
39     {
40         if (students[i].num == num)
41         {
42             flag = 1;
43             break;
44         }
45     }
46     if (flag)
47     {
48         printf("num:%d, name:%s, math:%d, english:%d, computer:%d, average:%.2f\n", \
49             students[i].num, students[i].name, students[i].math, students[i].english, students[i].computer, students[i].average);
50     }
51     else
52     {
53         printf("Not Found!\n");
54     }
55 };