drd/学籍管理系统7.cpp

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

// 定义学生结构体，包含学号、班级、姓名以及三门课程成绩
typedef struct Student {
    int id;
    int class_num;
    char name[20];
    double score1;
    double score2;
    double score3;
} Student;

// 交换两个学生结构体的函数
void swap(Student *a, Student *b) {
    Student temp = *a;
    *a = *b;
    *b = temp;
}

// 计算学生总成绩的函数
double totalScore(const Student *s) {
    return s->score1 + s->score2 + s->score3;
}

// 按照班级从小到大，同一班级内总成绩从大到小排序学生信息数组
void sortStudents(Student students[], int num_students) {
    for (int i = 0; i < num_students - 1; i++) {
        for (int j = 0; j < num_students - i - 1; j++) {
            if (students[j].class_num > students[j + 1].class_num) {
                swap(&students[j], &students[j + 1]);
            } else if (students[j].class_num == students[j + 1].class_num) {
                double cur_total = totalScore(&students[j]);
                double next_total = totalScore(&students[j + 1]);
                if (cur_total < next_total) {
                    swap(&students[j], &students[j + 1]);
                }
            }
        }
    }
}

// 根据不同查询条件查找满足要求的学生，返回满足条件的学生数量
int queryStudents(Student students[], int num_students, Student result[], int query_type, char query_condition[]) {
    int count = 0;
    if (query_type == 1) {
        // 查询班级范围
        int start_class, end_class;
        sscanf(query_condition, "%d-%d", &start_class, &end_class);
        for (int i = 0; i < num_students; i++) {
            if (students[i].class_num >= start_class && students[i].class_num <= end_class) {
                result[count++] = students[i];
            }
        }
    } else if (query_type == 2) {
        // 查询学号范围
        int start_id, end_id;
        sscanf(query_condition, "%d-%d", &start_id, &end_id);
        for (int i = 0; i < num_students; i++) {
            if (students[i].id >= start_id && students[i].id <= end_id) {
                result[count++] = students[i];
            }
        }
    } else if (query_type == 3) {
        // 查询姓名以特定字符串开头的学生
        char prefix[20];
        sscanf(query_condition, "%s", prefix);
        int prefix_len = strlen(prefix);
        for (int i = 0; i < num_students; i++) {
            if (strncmp(students[i].name, prefix, prefix_len) == 0) {
                result[count++] = students[i];
            }
        }
    } else if (query_type == 4) {
        // 查询总成绩大于等于特定分数的学生
        double min_score;
        sscanf(query_condition, "%lf", &min_score);
        for (int i = 0; i < num_students; i++) {
            if (totalScore(&students[i]) >= min_score) {
                result[count++] = students[i];
            }
        }
    } else if (query_type == 5) {
        // 查询特定班级内学号范围的学生
        int class_num;
        int start_id, end_id;
        sscanf(query_condition, "%d.%d-%d", &class_num, &start_id, &end_id);
        for (int i = 0; i < num_students; i++) {
            if (students[i].class_num == class_num && students[i].id >= start_id && students[i].id <= end_id) {
                result[count++] = students[i];
            }
        }
    }
    return count;
}

// 按照要求格式打印学生数组信息
void printStudents(Student students[], int num_students) {
    for (int i = 0; i < num_students; i++) {
        printf("%d %d %s %.1lf %.1lf %.1lf\n", students[i].id, students[i].class_num, students[i].name,
               students[i].score1, students[i].score2, students[i].score3);
    }
}

int main() {
    Student students[] = {
            {10001, 11, "Zhang", 99.5, 88.5, 89.5},
            {10002, 12, "Yang", 77.9, 56.5, 87.5},
            {10003, 11, "Liang", 92.5, 99.0, 60.5},
            {10004, 11, "Cai", 89.6, 56.9, 90.5},
            {10005, 14, "Fu", 55.6, 67.9, 98.9},
            {10006, 12, "Mao", 22.1, 45.9, 99.2},
            {10007, 13, "Zhan", 35.6, 67.9, 88.0}
    };
    int num_students = sizeof(students) / sizeof(students[0]);

    int query_type;
    char query_condition[50];
    printf("please input:\n");
    scanf("%d %s", &query_type, query_condition);

    Student result[100];  // 假设最多存放100个满足查询条件的学生信息
    int result_count = queryStudents(students, num_students, result, query_type, query_condition);
    sortStudents(result, result_count);
    printStudents(result, result_count);

    return 0;
}