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6.c

@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <string.h>
+
+struct Student {
+    char id[10];
+    int class_num;
+    char name[20];
+    float score[3];
+};
+
+void sort_students(struct Student students[], int size) {
+    int i, j;
+    for (i = 0; i < size; i++) {
+        for (j = i + 1; j < size; j++) {
+            if (students[i].class_num > students[j].class_num ||
+                (students[i].class_num == students[j].class_num &&
+                    students[i].score[0] + students[i].score[1] + students[i].score[2] <
+                    students[j].score[0] + students[j].score[1] + students[j].score[2])) {
+                struct Student temp = students[i];
+                students[i] = students[j];
+                students[j] = temp;
+            }
+        }
+    }
+}
+
+void print_student(struct Student student, int is_first) {
+    if (is_first) {
+        printf("%d %s %s %.1f %.1f %.1f ", student.class_num, student.id, student.name,
+            student.score[0], student.score[1], student.score[2]);
+    }
+    else {
+        printf("   %s %s %.1f %.1f %.1f\n", student.id, student.name,
+            student.score[0], student.score[1], student.score[2]);
+    }
+}
+
+int main() {
+    struct Student students[3] = {
+        {"10001", 11, "Zhang", {99.5, 88.5, 89.5}},
+        {"10002", 12, "Yang", {77.9, 56.5, 87.5}},
+        {"10003", 11, "Liang", {92.5, 99.0, 60.5}}
+    };
+    int size = sizeof(students) / sizeof(students[0]);
+
+    sort_students(students, size);
+
+    char search_id[10];
+    printf("请输入要修改的学生信息：\n");
+    scanf("%s %d %s %f %f %f", search_id, &students[0].class_num, students[0].name,
+        &students[0].score[0], &students[0].score[1], &students[0].score[2]);
+
+    int found = 0, i;
+    for (i = 0; i < size; i++) {
+        if (strcmp(students[i].id, search_id) == 0) {
+            found = 1;
+            students[i] = students[0];
+            break;
+        }
+    }
+
+    if (found) {
+        sort_students(students, size);
+        printf("%d ", students[0].class_num);
+        print_student(students[0], 1);
+        printf("modified\n");
+        for (i = 1; i < size; i++) {
+            if (students[i].class_num == students[i - 1].class_num) {
+                print_student(students[i], 0);
+            }
+            else {
+                printf("%d ", students[i].class_num);
+                print_student(students[i], 1);
+            }
+        }
+
+    }
+    else {
+        printf("未找到该学生信息\n");
+    }
+
+    return 0;
+}