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学籍管理系统6.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// 定义学生结构体，包含学号、班级、姓名以及三门课程成绩
+typedef struct Student {
+    int id;
+    int class_num;
+    char name[20];
+    double score1;
+    double score2;
+    double score3;
+} Student;
+
+// 交换两个学生结构体的函数
+void swap(Student *a, Student *b) {
+    Student temp = *a;
+    *a = *b;
+    *b = temp;
+}
+
+// 计算学生的总成绩
+double totalScore(const Student *s) {
+    return s->score1 + s->score2 + s->score3;
+}
+
+// 根据学号查找学生在数组中的索引位置，若没找到返回 -1
+int findStudentIndex(Student students[], int num_students, int target_id) {
+    for (int i = 0; i < num_students; i++) {
+        if (students[i].id == target_id) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+// 修改指定学号的学生信息，并重新调整数组顺序以保持有序
+void modifyStudent(Student students[], int *num_students, Student new_student) {
+    int index = findStudentIndex(students, *num_students, new_student.id);
+    if (index!= -1) {
+        students[index] = new_student;
+        // 从修改位置开始，向前比较调整顺序（保证班级从小到大，同一班级内总成绩从大到小）
+        for (int i = index; i > 0; i--) {
+            if (students[i].class_num < students[i - 1].class_num) {
+                swap(&students[i], &students[i - 1]);
+            } else if (students[i].class_num == students[i - 1].class_num) {
+                double cur_total = totalScore(&students[i]);
+                double prev_total = totalScore(&students[i - 1]);
+                if (cur_total > prev_total) {
+                    swap(&students[i], &students[i - 1]);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+        // 从修改位置开始，向后比较调整顺序
+        for (int i = index; i < *num_students - 1; i++) {
+            if (students[i].class_num > students[i + 1].class_num) {
+                swap(&students[i], &students[i + 1]);
+            } else if (students[i].class_num == students[i + 1].class_num) {
+                double cur_total = totalScore(&students[i]);
+                double next_total = totalScore(&students[i + 1]);
+                if (cur_total < next_total) {
+                    swap(&students[i], &students[i + 1]);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+    }
+}
+
+// 按照要求格式打印学生数组信息，同一班级的学生除第一个外缩进显示，且标记修改的学生
+void printStudents(Student students[], int num_students) {
+    int current_class = students[0].class_num;
+    for (int i = 0; i < num_students; i++) {
+        if (students[i].class_num == current_class) {
+            if (i == 0) {
+                printf("%d %d %s %.1lf %.1lf %.1lf", students[i].class_num, students[i].id, students[i].name,
+                       students[i].score1, students[i].score2, students[i].score3);
+            } else {
+                printf("   %d %s %.1lf %.1lf %.1lf", students[i].id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
+            }
+            if (i == num_students - 1 && findStudentIndex(students, num_students, students[i].id)!= -1) {
+                printf(" modified\n");
+            } else {
+                printf("\n");
+            }
+        } else {
+            current_class = students[i].class_num;
+            printf("%d %d %s %.1lf %.1lf %.1lf\n", students[i].class_num, students[i].id, students[i].name,
+                   students[i].score1, students[i].score2, students[i].score3);
+        }
+    }
+}
+
+int main() {
+    Student students[100];  // 假设最多存储100个学生信息，可根据实际情况调整大小
+    int num_students = 3;   // 初始已有3个学生信息
+
+    // 静态初始化已有三个学生信息（按题目给定示例）
+    Student s1 = {10001, 11, "Zhang", 99.5, 88.5, 89.5};
+    Student s2 = {10002, 12, "Yang", 77.9, 56.5, 87.5};
+    Student s3 = {10003, 11, "Liang", 92.5, 99.0, 60.5};
+    students[0] = s1;
+    students[1] = s2;
+    students[2] = s3;
+
+    Student new_student;
+    printf("please input:\n");
+    scanf("%d %d %s %lf %lf %lf", &new_student.id, &new_student.class_num, &new_student.name, &new_student.score1, &new_student.score2, &new_student.score3);
+
+    // 查找要修改的学生是否存在
+    int exist = findStudentIndex(students, num_students, new_student.id);
+    if (exist == -1) {
+        // 如果学生不存在，直接输出原有学生信息并结束程序
+        printStudents(students, num_students);
+        return 0;
+    }
+
+    // 如果学生存在，修改学生信息并输出更新后的信息
+    modifyStudent(students, &num_students, new_student);
+    printStudents(students, num_students);
+
+    return 0;
+}