lshxjglsy/final_step.c

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

#define MAX_STUDENTS 100

typedef struct {
    char id[20];
    char clas[20];
    char name[20];
    double score1;
    double score2;
    double score3;
    double total_score;
} Student;

Student students[MAX_STUDENTS];
int student_count = 0;

void display_menu();
void input_students();
void delete_student();
void select_student();
void order_students();
void output_students();
int compare_students(const void *a, const void *b);

int main() {
    char option;

    while (1) {
        display_menu();
        printf("please input your option\n");
        scanf(" %c", &option);

        switch (option) {
            case '1':
                input_students();
                break;
            case '2':
                delete_student();
                break;
            case '3':
                select_student();
                break;
            case '4':
                order_students();
                break;
            case '5':
                output_students();
                break;
            case '6':
                printf("Exiting the program.\n");
                return 0;
            default:
                printf("Invalid option. Please try again.\n");
        }
    }
    return 0;
}

void display_menu() {
    printf("1.input\n");
    printf("2.delete\n");
    printf("3.select\n");
    printf("4.order\n");
    printf("5.output\n");
    printf("6.quit\n");
}

void input_students() {
    char cont[4];
    do {
        if (student_count >= MAX_STUDENTS) {
            return;
        }

        printf("id ");
        scanf("%s", students[student_count].id);
        printf("class ");
        scanf("%s", students[student_count].clas);
        printf("name ");
        scanf("%s", students[student_count].name);
        printf("score1 ");
        scanf("%lf", &students[student_count].score1);
        printf("score2 ");
        scanf("%lf", &students[student_count].score2);
        printf("score3 ");
        scanf("%lf", &students[student_count].score3);

        students[student_count].total_score = students[student_count].score1 +
                                              students[student_count].score2 +
                                              students[student_count].score3;
        student_count++;

        printf("continue? ");
        scanf("%s", cont);
    } while (strcmp(cont, "yes") == 0);
}

void delete_student() {
    char input[20];
    char cont[4];
    do{
        scanf("%s", input);

        int i, found = 0;
        for (i = 0; i < student_count; i++) {
            if (strcmp(students[i].id, input) == 0 || strcmp(students[i].name, input) == 0) {
                found = 1;
                break;
            }
        }

        if (found) {
            for (int j = i; j < student_count - 1; j++) {
                students[j] = students[j + 1];
            }
            student_count--;
        } else {
            output_students();
        }
        printf("continue?\n");
        scanf("%s",cont);
    }while (strcmp(cont, "yes") == 0);
}

void select_student() {
    char input[20];
    scanf("%s", input);

    int found = 0;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].id, input) == 0 || strcmp(students[i].clas, input) == 0) {
            found = 1;
            printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",
                   students[i].id,
                   students[i].clas,
                   students[i].name,
                   students[i].score1,
                   students[i].score2,
                   students[i].score3,
                   students[i].total_score);
        }
    }

    if (!found) {
        printf("there is no eligible student\n");
    }
}

void order_students() {
    qsort(students, student_count, sizeof(Student), compare_students);
    printf("Students ordered successfully.\n");
}

void output_students() {
    for (int i = 0; i < student_count; i++) {
        printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",
               students[i].id,
               students[i].clas,
               students[i].name,
               students[i].score1,
               students[i].score2,
               students[i].score3,
               students[i].total_score);
    }
}

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

    int class_cmp = strcmp(studentA->clas, studentB->clas);
    if (class_cmp != 0) {
        return class_cmp;
    }

    if (studentA->total_score > studentB->total_score) {
        return -1;
    } else if (studentA->total_score < studentB->total_score) {
        return 1;
    }
    return 0;
}