gwgsyxyt/step6.c

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

#define NUM_STUDENTS 3
#define NAME_LEN 50

typedef struct {
    int id;
    int class;
    char name[NAME_LEN];
    float scores[3];
    float total;
} Student;

int compare(const void *a, const void *b) {
    Student *studentA = (Student *)a;
    Student *studentB = (Student *)b;

    if (studentA->class != studentB->class) {
        return studentA->class - studentB->class;
    } else {
        return studentB->total - studentA->total; 
    }
}


void calculateTotal(Student *student) {
    student->total = student->scores[0] + student->scores[1] + student->scores[2];
}


void printStudents(Student students[], int count) {
    int prevClass = -1;
    int i;
    for (i = 0; i < count; i++) {
        if (students[i].class != prevClass) {
            printf("%d", students[i].class);
            prevClass = students[i].class;
        } else {
            printf("   "); 
        }
        printf(" %d %s %.1f %.1f %.1f", students[i].id, students[i].name,
               students[i].scores[0], students[i].scores[1], students[i].scores[2]);


        if (i == NUM_STUDENTS - 1 || students[i + 1].class != students[i].class ||
            students[i + 1].id != students[i].id + 1) {

            printf(" modified\n");
        } else {
            printf("\n");
        }
    }
}

void modifyStudent(Student students[], int count, int id, int class, const char *name, float scores[]) {
    int i;
	for (i = 0; i < count; i++) {
        if (students[i].id == id) {
            students[i].class = class;
            strncpy(students[i].name, name, NAME_LEN);
            students[i].scores[0] = scores[0];
            students[i].scores[1] = scores[1];
            students[i].scores[2] = scores[2];
            calculateTotal(&students[i]);


            qsort(students, count, sizeof(Student), compare);
            return;
        }
    }

}

int main() {

    Student students[NUM_STUDENTS] = {
        {10001, 11, "Zhang", {99.5, 88.5, 89.5}, 0},
        {10002, 12, "Yang", {77.9, 56.5, 87.5}, 0},
        {10003, 11, "Liang", {92.5, 99.0, 60.5}, 0}
    };

    
    int i;
    for (i = 0; i < NUM_STUDENTS; i++) {
        calculateTotal(&students[i]);
    }

    qsort(students, NUM_STUDENTS, sizeof(Student), compare);

    int id, class;
    char name[NAME_LEN];
    float scores[3];
    printf("\n");
    scanf("%d %d %s %f %f %f", &id, &class, name, &scores[0], &scores[1], &scores[2]);

    modifyStudent(students, NUM_STUDENTS, id, class, name, scores);

    printStudents(students, NUM_STUDENTS);

    return 0;
}