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step4.c

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+#include <stdio.h>
+#include <string.h>
+
+#define MAX_STUDENT_NUM 100
+#define MAX_NAME_LENGTH 20
+
+typedef struct student_info {
+    int id;
+    int cls;
+    float scores[3];
+    float total_score;
+    float avg_score;
+    int is_inserted;  // 标记是否是插入的学生
+} student;
+
+void calc_score(student students[], int num) {
+    int i, j;
+    for (i = 0; i < num; i++) {
+        float total_score = 0;
+        for (j = 0; j < 3; j++) {
+            total_score += students[i].scores[j];
+        }
+        students[i].total_score = total_score;
+        students[i].avg_score = total_score / 3;
+    }
+}
+
+void insert_student(student students[], int* num, int id, int cls, float scores[3]) {
+    // 插入新学生信息
+    students[*num].id = id;
+    students[*num].cls = cls;
+    students[*num].scores[0] = scores[0];
+    students[*num].scores[1] = scores[1];
+    students[*num].scores[2] = scores[2];
+    students[*num].is_inserted = 1;  // 设置标记为插入的学生
+
+    (*num)++;
+}
+
+void sort_students(student students[], int num) {
+    // 使用冒泡排序，按cls升序，total_score降序
+    for (int i = 0; i < num - 1; i++) {
+        for (int j = 0; j < num - i - 1; j++) {
+            if (students[j].cls > students[j + 1].cls ||
+                (students[j].cls == students[j + 1].cls && students[j].total_score < students[j + 1].total_score)) {
+                // 交换元素
+                student temp = students[j];
+                students[j] = students[j + 1];
+                students[j + 1] = temp;
+            }
+        }
+    }
+}
+
+int main() {
+    student students[MAX_STUDENT_NUM] = {
+        {10001, 11, {99.5, 88.5, 89.5}},
+        {10002, 12, {77.9, 56.5, 87.5}},
+        {10003, 11, {92.5, 99.0, 60.5}}
+    };
+
+    int num = 3;  // 已有学生数目
+    int id, cls, i;
+    float scores[3];
+
+    printf("Please enter new student information:\n");
+    scanf("%d %d %f %f %f", &id, &cls, &scores[0], &scores[1], &scores[2]);
+
+    // 检查学号是否已存在
+    for (i = 0; i < num; i++) {
+        if (students[i].id == id) {
+            printf("学号为%d的学生已存在\n", id);
+            return 0;
+        }
+    }
+
+    insert_student(students, &num, id, cls, scores);
+    calc_score(students, num);
+    sort_students(students, num);
+
+    for (i = 0; i < num; i++) {
+        printf("%d %d %.1f %.1f %.1f", students[i].id, students[i].cls, students[i].scores[0], students[i].scores[1], students[i].scores[2]);
+
+        // 如果是插入的学生，则输出 "insert"
+        if (students[i].is_inserted == 1) {
+            printf(" insert");
+        }
+
+        printf("\n");
+    }
+
+    return 0;
+}