qwe/b3.c

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


struct  Student {
    int student_id;
    float math_score;
    float physics_score;
    float english_score;
    float total_score;
    float average_score;
} Student;



void swap(struct Student *a, struct Student *b) {
	struct Student temp;
    temp = *a;
    *a = *b;
    *b = temp;
}



void sortStudentsByTotalScore(struct Student students[], int num)
 {
 	int i,j;
    for (i = 0; i < num- 1; i++) {
        for (j = 0; j < num - i - 1; j++) {
            if (students[j].total_score > students[j + 1].total_score) {
                swap(&students[j], &students[j + 1]);
            }
        }
    }
}

void display_menu() {
    printf("%30s 1. Input\n", "");
    printf("%30s 2. Output\n", "");
    printf("%30s 3. Order\n", "");
    printf("%30s 4. Quit\n", "");
}

void input_students(struct Student *students) {
    printf("Please input info of the three students:\n");
    int i;
    for (i = 0; i < 3; i++) {
        scanf("%d", &students[i].student_id);
        scanf("%f", &students[i].math_score);
        scanf("%f", &students[i].physics_score);
        scanf("%f", &students[i].english_score);
        students[i].total_score = students[i].math_score + students[i].physics_score + students[i].english_score;
        students[i].average_score = students[i].total_score / 3.0;
    }
    
	sortStudentsByTotalScore(students, 3);
    for (i = 0; i < 3; i++) {
        printf("%d,%.1f,%.1f\n", students[i].student_id, students[i].total_score, students[i].average_score);
    }
}

int main() {
    struct Student students[3];
    char user_input[2];

    while (1) {
        display_menu();
        scanf("%1s", user_input);  

        switch (user_input[0]) {
            case 'i':
                input_students(students);
                break;
            case 'o':
                printf("%30s You are trying to Output info\n"," ");
                break;
            case 'm':
                printf("%30s You are trying to Make things ordered\n", "");
                break;
            case 'q':
                printf("%30s You are about to Quit\n", "");
               
            default:
                printf("%30s Wrong input\n", "");
                break;
        }
    }

    return 0;
}