改正代码，错误比较多

Question

QQ上发代码，QQ2068551359

1.题目

学生GPA查询系统。

2.要求

(1)学生属性包括:学号、姓名、院系和GPA等，数据从文件( student_ data.txt) 中读取。

(2)提供菜单选项功能

(3)提供显示输出功能。

(4)提供排序功能，能够按学号和GPA排序，自由选择升序或降序

(5)提供查询功能，能够按姓名、年级和GPA区间查询。(6)提供统计功能，统计各学院人数。

(7)提供退出功能。

Answer 1

【以下回答由 GPT 生成】

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct Student {
    char id[10];  // 学号
    char name[20];  // 姓名
    char department[30];  // 院系
    float gpa;  // GPA
};

int menu() {
    int choice;
    printf("\n学生GPA查询系统\n");
    printf("===========================\n");
    printf("1. 显示所有学生信息\n");
    printf("2. 按学号排序\n");
    printf("3. 按GPA排序\n");
    printf("4. 按姓名查询\n");
    printf("5. 按年级查询\n");
    printf("6. 按GPA区间查询\n");
    printf("7. 统计各学院人数\n");
    printf("8. 退出\n");
    printf("===========================\n");
    printf("请输入您的选择：");
    scanf("%d", &choice);
    return choice;
}

void displayStudents(struct Student students[], int count) {
    printf("\n学生信息\n");
    printf("===========================\n");
    printf("%-10s %-20s %-30s %-4s\n", "学号", "姓名", "院系", "GPA");
    printf("-----------------------------------------\n");
    for (int i = 0; i < count; i++) {
        printf("%-10s %-20s %-30s %-4.2f\n", students[i].id, students[i].name, students[i].department, students[i].gpa);
    }
    printf("===========================\n");
}

void sortById(struct Student students[], int count) {
    struct Student temp;
    for (int i = 0; i < count - 1; i++) {
        for (int j = 0; j < count - i - 1; j++) {
            if (strcmp(students[j].id, students[j + 1].id) > 0) {
                temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }
    printf("按学号排序完成。\n");
}

void sortByGpa(struct Student students[], int count) {
    struct Student temp;
    for (int i = 0; i < count - 1; i++) {
        for (int j = 0; j < count - i - 1; j++) {
            if (students[j].gpa > students[j + 1].gpa) {
                temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }
    printf("按GPA排序完成。\n");
}

void searchByName(struct Student students[], int count, char name[]) {
    printf("查询结果：\n");
    printf("===========================\n");
    printf("%-10s %-20s %-30s %-4s\n", "学号", "姓名", "院系", "GPA");
    printf("-----------------------------------------\n");
    for (int i = 0; i < count; i++) {
        if (strcmp(students[i].name, name) == 0) {
            printf("%-10s %-20s %-30s %-4.2f\n", students[i].id, students[i].name, students[i].department, students[i].gpa);
        }
    }
    printf("===========================\n");
}

void searchByGrade(struct Student students[], int count, int grade) {
    printf("查询结果：\n");
    printf("===========================\n");
    printf("%-10s %-20s %-30s %-4s\n", "学号", "姓名", "院系", "GPA");
    printf("-----------------------------------------\n");
    for (int i = 0; i < count; i++) {
        int studentGrade = atoi(students[i].id) / 10000;
        if (studentGrade == grade) {
            printf("%-10s %-20s %-30s %-4.2f\n", students[i].id, students[i].name, students[i].department, students[i].gpa);
        }
    }
    printf("===========================\n");
}

void searchByGpaRange(struct Student students[], int count, float minGpa, float maxGpa) {
    printf("查询结果：\n");
    printf("===========================\n");
    printf("%-10s %-20s %-30s %-4s\n", "学号", "姓名", "院系", "GPA");
    printf("-----------------------------------------\n");
    for (int i = 0; i < count; i++) {
        if (students[i].gpa >= minGpa && students[i].gpa <= maxGpa) {
            printf("%-10s %-20s %-30s %-4.2f\n", students[i].id, students[i].name, students[i].department, students[i].gpa);
        }
    }
    printf("===========================\n");
}

void countByDepartment(struct Student students[], int count) {
    printf("各学院人数统计：\n");
    printf("===========================\n");
    printf("%-30s %-4s\n", "院系", "人数");
    printf("-----------------------------------------\n");

    int numDepartments = 0;
    char departments[100][30];  // 修改数组大小以适应预计的最大学院数量
    int departmentCounts[100];  // 修改数组大小以适应预计的最大学院数量

    for (int i = 0; i < count; i++) {
        int found = 0;
        for (int j = 0; j < numDepartments; j++) {
            if (strcmp(students[i].department, departments[j]) == 0) {
                departmentCounts[j]++;
                found = 1;
                break;
            }
        }
        if (!found) {
            strcpy(departments[numDepartments], students[i].department);
            departmentCounts[numDepartments] = 1;
            numDepartments++;
        }
    }

    for (int i = 0; i < numDepartments; i++) {
        printf("%-30s %-4d\n", departments[i], departmentCounts[i]);
    }
    printf("===========================\n");
}

int main() {
    FILE *file = fopen("student_data.txt", "r");
    if (file == NULL) {
        printf("无法打开文件！\n");
        return 1;
    }
    int count = 0;
    struct Student students[100];
    while (fscanf(file, "%s %s %s %f", students[count].id, students[count].name, students[count].department, &students[count].gpa) == 4) {
        count++;
    }
    fclose(file);

    int choice;
    char name[20];
    int grade;
    float minGpa, maxGpa;

    do {
        choice = menu();

        switch(choice) {
            case 1:
                displayStudents(students, count);
                break;
            case 2:
                sortById(students, count);
                break;
            case 3:
                sortByGpa(students, count);
                break;
            case 4:
                printf("请输入要查询的姓名：");
                scanf("%s", name);
                searchByName(students, count, name);
                break;
            case 5:
                printf("请输入要查询的年级：");
                scanf("%d", &grade);
                searchByGrade(students, count, grade);
                break;
            case 6:
                printf("请输入GPA区间的最小值：");
                scanf("%f", &minGpa);
                printf("请输入GPA区间的最大值：");
                scanf("%f", &maxGpa);
                searchByGpaRange(students, count, minGpa, maxGpa);
                break;
            case 7:
                countByDepartment(students, count);
                break;
            case 8:
                printf("感谢使用学生GPA查询系统！再见！\n");
                break;
            default:
                printf("无效的选择！请重新输入。\n");
                break;
        }
    } while (choice != 8);

    return 0;
}

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