多文件模块的学生信息库系统

student.h

#include<stdio.h>
#include<string.h>
#define MaxSize 50
struct student
{
    int num;
    char name[10];
    int computer, english, math;
    double average;
};
void new_student(struct student students[]);
void output_student(struct student students[]);
void average(struct student students[]);
void sort(struct student students[]);
void modify(struct student students[]);
void search_student(struct student students[], int num);

main.c

#include "student.h"
int Count = 0;
int main(void)
{
    struct student students[MaxSize];
    new_student(students);
    average(students);
    printf("New\n");
    output_student(students);
    sort(students);
    printf("After Sort:\n");
    output_student(students);
    modify(students);
    printf("After Modify:\n");
    output_student(students);
    int num;
    printf("Enter num:");
    scanf_s("%d", &num);
    search_student(students, num);

    return 0;
}

input_output.c

#include "student.h"

extern Count;
void new_student(struct student students[])
{
    int i, n;
    if (Count == MaxSize)
    {
        printf("The array is full!\n");

        return;
    }
    printf("Input the Number of Students:");
    scanf_s("%d", &n);
    for (i = 0; i < n; i++)
    {
        printf("Input the student's num:");
        scanf_s("%d", &students[i].num);
        printf_s("Input the student's name:");
        scanf_s("%s", students[i].name, 10);
        printf("Input the student's math.score:");
        scanf_s("%d", &students[i].math);
        printf("Input the student's english.score:");
        scanf_s("%d", &students[i].english);
        printf("Input the student's computer.score:");
        scanf_s("%d", &students[i].computer);

        Count++;
    }
}
void output_student(struct student students[])
{
    int i;
    if (Count == 0)
    {
        printf("Count of students is zero!\n");
        return;
    }
    printf("num\tname\tmath\tenglish\tcomputer\taverage\n");
    for (i = 0; i < Count; i++)
    {
        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);
    }
}

aver_sort.c

#include "student.h"
extern Count;
void average(struct student students[])
{
    int i;
    for (i = 0; i < Count; i++)
    {
        students[i].average = 1.0 * (students[i].math + students[i].english + students[i].computer) / 3;
    }
}
void sort(struct student students[])
{
    struct student temp;
    int i, j, index;
    for (i = 0; i < Count - 1; i++)
    {
        index = i;
        for (j = i + 1; j < Count; j++)
        {
            if (students[j].average > students[index].average)
            {
                index = j;
            }
        }
        temp = students[i];
        students[i] = students[index];
        students[index] = temp;
    }
}

modify.c

#include "student.h"
extern Count;
void modify(struct student students[])
{
    int num, course, score, i;
    struct student* p = students;
    printf("Input the number of the students to be updated:");
    scanf_s("%d", &num);
    printf("Choice the course:1.math 2.english 3.computer:");
    scanf_s("%d", &course);
    printf("Input the new score:");
    scanf_s("%d", &score);
    for (i = 0; i < Count; i++, p++)
    {
        if (p->num == num)
        {
            break;
        }
    }
    if (i < Count)
    {
        switch (course)
        {
        case 1:p->math = score; break;
        case 2:p->english = score; break;
        case 3:p->computer = score; break;
        }
    }
}
void search_student(struct student students[], int num)
{
    int i, flag = 0;
    if (Count == 0)
    {
        printf("Count of students is zero!\n");
        return;
    }
    for (i = 0; i < Count; i++)
    {
        if (students[i].num == num)
        {
            flag = 1;
            break;
        }
    }
    if (flag)
    {
        printf("num:%d, name:%s, math:%d, english:%d, computer:%d, average:%.2f\n", \
            students[i].num, students[i].name, students[i].math, students[i].english, students[i].computer, students[i].average);
    }
    else
    {
        printf("Not Found!\n");
    }
};