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$RZBOZ36.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+
+// 定义结构体来存储学生信息
+struct Student {
+    int id;
+    int class_num;
+    float grade1;
+    float grade2;
+    float grade3;
+};
+
+// 比较两个学生的大小，用于排序
+int compareStudents(const void *a, const void *b) {
+    struct Student *studentA = (struct Student *)a;
+    struct Student *studentB = (struct Student *)b;
+
+    if (studentA->class_num < studentB->class_num) {
+        return -1;
+    } else if (studentA->class_num > studentB->class_num) {
+        return 1;
+    } else {
+        // 班级相同，比较总成绩
+        float totalA = studentA->grade1 + studentA->grade2 + studentA->grade3;
+        float totalB = studentB->grade1 + studentB->grade2 + studentB->grade3;
+
+        if (totalA > totalB) {
+            return -1;
+        } else if (totalA < totalB) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+}
+
+// 插入新学生信息到数组中，并保持数组有序
+void insertStudent(struct Student students[], int *size, struct Student newStudent) {
+    int i;
+    // 找到插入位置
+    for (i = 0; i < *size; i++) {
+        if (compareStudents(&newStudent, &students[i]) > 0) {
+            continue;
+        } else {
+            break;
+        }
+    }
+
+    // 移动元素腾出插入位置
+    for (int j = *size; j > i; j--) {
+        students[j] = students[j - 1];
+    }
+
+    // 插入新学生
+    students[i] = newStudent;
+    (*size)++;
+}
+
+// 检查学号是否已存在
+int checkIdExists(struct Student students[], int size, int id) {
+    for (int i = 0; i < size; i++) {
+        if (students[i].id == id) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+// 输出所有学生信息
+void printStudents(struct Student students[], int size) {
+    for (int i = 0; i < size; i++) {
+        printf("%d %d %.1f %.1f %.1f", students[i].id, students[i].class_num, students[i].grade1, students[i].grade2, students[i].grade3);
+        if (i == size - 1) {
+            printf(" inserted\n");
+        } else {
+            printf("\n");
+        }
+    }
+}
+
+int main() {
+    // 初始化已有学生信息数组
+    struct Student students[100];
+    students[0].id = 10001;
+    students[0].class_num = 11;
+    students[0].grade1 = 99.5;
+    students[0].grade2 = 88.5;
+    students[0].grade3 = 89.5;
+
+    students[1].id = 10002;
+    students[1].class_num = 12;
+    students[1].grade1 = 77.9;
+    students[1].grade2 = 56.5;
+    students[1].grade3 = 87.5;
+
+    students[2].id = 10003;
+    students[2].class_num = 11;
+    students[2].grade1 = 92.5;
+    students[2].grade2 = 99.0;
+    students[2].grade3 = 60.5;
+
+    int size = 3;
+
+    // 输入新学生信息
+    struct Student newStudent;
+    printf("请输入新学生的信息（学号 班级 成绩1 成绩2 成绩3）：");
+    scanf("%d %d %f %f %f", &newStudent.id, &newStudent.class_num, &newStudent.grade1, &newStudent.grade2, &newStudent.grade3);
+
+    // 检查学号是否已存在
+    int existsIndex = checkIdExists(students, size, newStudent.id);
+    if (existsIndex!= -1) {
+        printf("已存在学号的信息：\n");
+        printStudents(students, size);
+        return 0;
+    }
+
+    // 插入新学生信息
+    insertStudent(students, &size, newStudent);
+
+    // 输出所有学生信息
+    printStudents(students, size);
+
+    return 0;
+}