ADD file via upload

未命名4.cpp

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+#define _CRT_SECURE_NO_WARNINGS 1
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define MAX_STUDENTS 100
+typedef struct {
+    int id;
+    int classs;
+    float scores[3];
+    float total_score;
+    int isnew;
+} Student;
+Student initial_students[] = {
+    {10001, 11, {99.5, 88.5, 89.5}, 277.5, 0},
+    {10002, 12, {77.9, 56.5, 87.5}, 221.9, 0},
+    {10003, 11, {92.5, 99.0, 60.5}, 252.0, 0}
+};
+Student* students;
+int num_students = 3;
+int compare(const void* a, const void* b) {
+    Student* student_a = (Student*)a;
+    Student* student_b = (Student*)b;
+    if (student_a->classs != student_b->classs) {
+        return student_a->classs - student_b->classs;
+    }
+    else {
+        return student_b->total_score - student_a->total_score;
+    }
+}
+int check_id_exists(int id) {
+    int i;for ( i = 0; i < num_students; i++) {
+        if (students[i].id == id) {
+            return 1;
+        }
+    }
+    return 0;
+}
+void insert_student(Student new_student) {
+    new_student.isnew = 1;
+    num_students++;
+    students = (Student*)realloc(students, num_students * sizeof(Student));
+    students[num_students - 1] = new_student;
+    qsort(students, num_students, sizeof(Student), compare);
+}
+void print_students() {
+    int i;for ( i = 0; i < num_students; i++) {
+        printf("%d %d %.1f %.1f %.1f", students[i].id, students[i].classs, students[i].scores[0], students[i].scores[1], students[i].scores[2]);
+        if (students[i].isnew) {
+            printf(" inserted");
+        }
+        printf("\n");
+    }
+}
+int main() {
+    students = (Student*)malloc(MAX_STUDENTS * sizeof(Student));
+    memcpy(students, initial_students, num_students * sizeof(Student));
+    Student new_student;
+    printf("请输入新学生的信息（学号 班级 成绩1 成绩2 成绩3）：\n");
+    scanf("%d %d %f %f %f", &new_student.id, &new_student.classs, &new_student.scores[0], &new_student.scores[1], &new_student.scores[2]);
+    new_student.total_score = new_student.scores[0] + new_student.scores[1] + new_student.scores[2];
+    if (check_id_exists(new_student.id)) {
+        printf("学号 %d 已存在，信息如下：\n", new_student.id);
+        int i;for ( i = 0; i < num_students; i++) {
+            if (students[i].id == new_student.id) {
+                printf("%d %d %.1f %.1f %.1f\n", students[i].id, students[i].classs, students[i].scores[0], students[i].scores[1], students[i].scores[2]);
+                break;
+            }
+        }
+    }
+    else {
+        insert_student(new_student);
+        print_students();
+    }
+    free(students);
+    return 0;
+}
+
+