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#include <stdio.h>
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#include <stdlib.h> // 包含了 qsort 函数所需的头文件
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#include <string.h> // 包含了字符串处理函数所需的头文件
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// 学生信息的结构体
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struct Student {
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int student_id;
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int class_id;
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char name[50];
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float score1;
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float score2;
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float score3;
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};
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// 比较函数，用于排序
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int compareStudents(const void *a, const void *b) {
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struct Student *student1 = (struct Student *)a;
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struct Student *student2 = (struct Student *)b;
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if (student1->class_id != student2->class_id) {
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return student1->class_id - student2->class_id;
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} else {
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float total_score1 = student1->score1 + student1->score2 + student1->score3;
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float total_score2 = student2->score1 + student2->score2 + student2->score3;
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return total_score2 - total_score1;
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}
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}
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int main() {
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struct Student students[100];
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int num_students = 3; // 初始有3个学生信息
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// 初始化已有学生信息
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students[0] = (struct Student){10001, 11, "Zhang", 99.5, 88.5, 89.5};
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students[1] = (struct Student){10002, 12, "Yang", 77.9, 56.5, 87.5};
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students[2] = (struct Student){10003, 11, "Liang", 92.5, 99.0, 60.5};
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// 对已有学生信息进行排序
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qsort(students, num_students, sizeof(struct Student), compareStudents);
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// 输入待修改学生的信息
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struct Student modified_student;
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printf("输入待修改学生的信息（学号 班级 姓名 成绩1 成绩2 成绩3）：");
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scanf("%d %d %s %f %f %f", &modified_student.student_id, &modified_student.class_id, modified_student.name, &modified_student.score1, &modified_student.score2, &modified_student.score3);
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// 检查学号是否存在，如果不存在，输出原有三个学生信息并退出程序
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int found = 0;
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for (int i = 0; i < num_students; i++) {
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if (modified_student.student_id == students[i].student_id) {
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found = 1;
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students[i] = modified_student;
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break;
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}
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}
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if (!found) {
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printf("该学生信息不存在，输出原有三个学生信息并退出程序：\n");
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for (int i = 0; i < num_students; i++) {
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printf("%d %d %s %.1f %.1f %.1f\n", students[i].student_id, students[i].class_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
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}
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return 0;
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}
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// 对新数据进行排序
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qsort(students, num_students, sizeof(struct Student), compareStudents);
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// 输出学生信息
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for (int i = 0; i < num_students; i++) {
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if (i == 0 || students[i].class_id != students[i - 1].class_id) {
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printf("%d %d %s %.1f %.1f %.1f", students[i].student_id, students[i].class_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
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} else {
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printf(" %d %s %.1f %.1f %.1f", students[i].student_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
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}
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if (i == num_students - 1) {
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printf(" modified\n");
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} else {
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printf("\n");
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}
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}
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return 0;
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}
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