xjgl/step3.c

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

#define N 3

struct student {
    int id;
    float math, physics, english, total, average;
};

void input(struct student stu[]) {
    int i;
    printf("Please input info of the three students:\n");
    for (i = 0; i < N; i++) {
        scanf("%d%f%f%f", &stu[i].id, &stu[i].math, &stu[i].physics, &stu[i].english);
        stu[i].total = stu[i].math + stu[i].physics + stu[i].english;
        stu[i].average = stu[i].total / 3.0;
    }
}

void output(struct student stu[]) {
    int i;
    printf("Output student info:\n");
    for (i = 0; i < N; i++) {
        printf("Student %d,%.1f,%.1f,%.1f,%.1f\n", stu[i].id, stu[i].math, stu[i].physics, stu[i].english, stu[i].total);
    }
}

void order(struct student stu[]) {
    int i, j;
    struct student temp;
    for (i = 0; i < N - 1; i++) {
        for (j = 0; j < N - 1 - i; j++) {
            if (stu[j].total > stu[j + 1].total) {
                temp = stu[j];
                stu[j] = stu[j + 1];
                stu[j + 1] = temp;
            }
        }
    }
    for (i = 0; i < N; i++) {
        printf("Student %d,%.1f,%.1f,%.1f,%.1f,%.1f\n", stu[i].id, stu[i].total, stu[i].average);
    }
}

int main() {
    struct student stu[N];
    char choice;
    while (1) {
        printf("                              1. Input\n");
        printf("                              2. Output\n");
        printf("                              3. Order\n");
        printf("                              4. Quit\n");
        printf("Please choose the operation:\n");

        // 读取用户输入并消耗换行符
        scanf(" %c", &choice);

        switch (choice) {
        case 'i':
            input(stu);
            output(stu);
            break;
        case 'o':
            output(stu);
            break;
        case 'r':
            printf("You are trying to Make things ordered\n");
            break;
        case 'q':
            printf("You are about to Quit\n");
            exit(0);
        default:
            printf("Wrong input\n");
            break;
        }
    }
    return 0;
}