gwgsyxyt/step5.c

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

typedef struct {
    char id[7];
    char class_num[3];
    char name[20];
    float math_score;
    float physics_score;
    float english_score;
} Student;

int compare_students(const void *a, const void *b) {
    Student *studentA = (Student *)a;
    Student *studentB = (Student *)b;
    int class_cmp = strcmp(studentA->class_num, studentB->class_num);
    if (class_cmp == 0) {
        float total_A = studentA->math_score + studentA->physics_score + studentA->english_score;
        float total_B = studentB->math_score + studentB->physics_score + studentB->english_score;
        if (total_B - total_A > 0) return -1;
        else if (total_B - total_A < 0) return 1;
        else return 0;
    } else {
        return class_cmp;
    }
}

Student* find_student(Student students[], int count, const char *key) {
    for (int i = 0; i < count; i++) {
        if (strcmp(students[i].id, key) == 0 || strcmp(students[i].name, key) == 0) {
            return &students[i];
        }
    }
    return NULL;
}


void delete_student(Student students[], int *count, Student *to_delete) {
    for (int i = 0; i < *count; i++) {
        if (students[i].id == to_delete->id) {
            for (int j = i; j < *count - 1; j++) {
                students[j] = students[j + 1];
            }
            (*count)--;
            break;
        }
    }
}


void print_students(Student students[], int count) {
    for (int i = 0; i < count; i++) {
        printf("%s %s %s %.1f %.1f %.1f\n", students[i].id, students[i].class_num, students[i].name,
               students[i].math_score, students[i].physics_score, students[i].english_score);
    }
}

int main() {

    Student students[3] = {
        {"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}
    };
    int student_count = 3;

    qsort(students, student_count, sizeof(Student), compare_students);

    char input[50];
    printf("");
    scanf("%s", input);
    
    while (getchar() != '\n');


    Student *found_student = find_student(students, student_count, input);
    if (found_student) {
        printf("\n");
        char confirmation[10];
        printf("Are you sure? (yes/no): ");
        scanf("%s", confirmation);
        
        while (getchar() != '\n');
        if (strcmp(confirmation, "yes") == 0 || strcmp(confirmation, "y") == 0) {
            delete_student(students, &student_count, found_student);
            printf("n");
        } else {
            printf("\n");
        }
    } else {
        printf("n");
    }

    print_students(students, student_count);

    return 0;
}