hwh/7th.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 100
typedef struct {
    int id;
    int class;
    char name[20];
    float scores[3];
} Student;
Student students[MAX_STUDENTS];
int studentCount = 0;
//已知数据 
void readStudents() {
    const int count = 7;
    static const int ids[] = {10001, 10002, 10003, 10004, 10005, 10006, 10007};
    static const int classes[] = {11, 12, 11, 11, 14, 12, 13};
    static const char *names[] = {"Zhang", "Yang", "Liang", "Cai", "Fu", "Mao", "Zhan"};
    static const float scores[][3] = {{99.5, 88.5, 89.5}, {77.9, 56.5, 87.5}, {92.5, 99.0, 60.5},
                                      {89.6, 56.9, 90.5}, {55.6, 67.9, 98.9}, {22.1, 45.9, 99.2},
                                      {35.6, 67.9, 88.0}};
    int i,j; 
    for (i = 0; i < count; ++i) {
        students[i].id = ids[i];
        students[i].class = classes[i];
        strcpy(students[i].name, names[i]);
        for (j = 0; j < 3; ++j) {
            students[i].scores[j] = scores[i][j];
        }
    }
    studentCount = count;
}

// 比较函数，用于qsort
int compareStudents(const void *a, const void *b) {
    Student *sa = (Student *)a;
    Student *sb = (Student *)b;
    if (sa->class != sb->class) {
        return sa->class - sb->class;
    } else {
        float scoreA = sa->scores[0] + sa->scores[1] + sa->scores[2];
        float scoreB = sb->scores[0] + sb->scores[1] + sb->scores[2];
        return scoreB > scoreA ? 1 : -1;
    }
}
// 对学生信息进行排序
void sortStudents(Student *students, int n) {
    qsort(students, n, sizeof(Student), compareStudents);
}
// 根据查询条件筛选学生信息
void filterStudents(Student *students, int n, char *query, Student **result, int *resultCount) {
    *resultCount = 0;
    char type;
    sscanf(query, "%c", &type);
    switch (type) {
        case '1': {
            int startClass, endClass;
            sscanf(query, "%*c %d-%d", &startClass, &endClass);
            int l;
			for (l = 0; l< n; ++l) {
                if (students[l].class >= startClass && students[l].class <= endClass) {
                    result[*resultCount] = &students[l];
                    (*resultCount)++;
                }
            }
            break;
        }
        case '2': {
            int startId, endId;
            sscanf(query, "%*c %d-%d", &startId, &endId);
            int m;
			for ( m = 0; m < n; ++m) {
                if (students[m].id >= startId && students[m].id <= endId) {
                    result[*resultCount] = &students[m];
                    (*resultCount)++;
                }
            }
            break;
        }
        case '3': {
            char prefix[20];
            sscanf(query, "%*c %s", prefix);
            prefix[strcspn(prefix,"*")]=0;
            int i1;
            for (i1 = 0; i1 < n; ++i1) {
                if (strncmp(students[i1].name, prefix, strlen(prefix)) == 0) {
                    result[*resultCount] = &students[i1];
                    (*resultCount)++;
                }
            }
            break;
        }
        case '4': {
            float minScore;
            sscanf(query, "%*c %f", &minScore);
            int i2;
            for ( i2 = 0; i2 < n; ++i2) {
                float totalScore = students[i2].scores[0] + students[i2].scores[1] + students[i2].scores[2];
                if (totalScore >= minScore) {
                    result[*resultCount] = &students[i2];
                    (*resultCount)++;
                }
            }
            break;
        }
        case '5': {
            int class, startId, endId;
            sscanf(query, "%*c %d.%d-%d", &class, &startId, &endId);
            int i3;
			for (i3 = 0; i3 < n; ++i3) {
                if (students[i3].class == class && students[i3].id >= startId && students[i3].id <= endId) {
                    result[*resultCount] = &students[i3];
                    (*resultCount)++;
                }
            }
            break;
        }
        default:
            printf("Invalid query format.\n");
            break;
    }
}

// 输出学生信息
void printStudents(Student *students[], int n) {
	int i4;
    for (i4 = 0; i4 < n; ++i4) {
        printf("%d %d %s %.1f %.1f %.1f\n", students[i4]->id, students[i4]->class, students[i4]->name,
               students[i4]->scores[0], students[i4]->scores[1], students[i4]->scores[2]);
    }
}
int main() {
    readStudents();
    sortStudents(students, studentCount);

    char query[100];
    fgets(query, sizeof(query), stdin);
    query[strcspn(query, "\n")] = 0; // 移除换行符

    Student *results[MAX_STUDENTS];
    int resultCount;
    filterStudents(students, studentCount, query, results, &resultCount);

    printStudents(results, resultCount);

    return 0;
}