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step3.c

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+#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;
+}