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cs6.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_STUDENTS 100
+
+typedef struct {
+    char id[20];
+    char clas[20];
+    char name[20];
+    double score1;
+    double score2;
+    double score3;
+    double totalScore;
+} Student;
+
+// Comparison function for sorting
+int compareStudents(const void *a, const void *b) {
+    Student *studentA = (Student *)a;
+    Student *studentB = (Student *)b;
+    int classComparison = strcmp(studentA->clas, studentB->clas);
+    if (classComparison != 0) {
+        return classComparison;
+    } else {
+        return (studentB->totalScore - studentA->totalScore > 0) ? 1 : -1;
+    }
+}
+
+void modifyStudent(Student students[], int *count) {
+    char id[20], clas[20], name[20];
+    double score1, score2, score3;
+
+    printf("Enter student id to modify: ");
+    scanf("%s", id);
+    for (int i = 0; i < *count; i++) {
+        if (strcmp(students[i].id, id) == 0) {
+            printf("Enter class, name, score1, score2, score3: ");
+            scanf("%s %s %lf %lf %lf", clas, name, &score1, &score2, &score3);
+            strcpy(students[i].clas, clas);
+            strcpy(students[i].name, name);
+            students[i].score1 = score1;
+            students[i].score2 = score2;
+            students[i].score3 = score3;
+            students[i].totalScore = score1 + score2 + score3;
+            qsort(students, *count, sizeof(Student), compareStudents);
+            printf("Student modified.\n");
+            return;
+        }
+    }
+    printf("Student not found.\n");
+}
+
+void printStudents(const Student students[], int count) {
+    for (int i = 0; i < count; i++) {
+        if (i == 0 || strcmp(students[i].clas, students[i-1].clas) != 0) {
+            printf("%s ", students[i].clas);
+        }
+        printf("%s %s %.1f %.1f %.1f", students[i].id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
+        if (i == count - 1 || strcmp(students[i+1].clas, students[i].clas) != 0) {
+            printf(" \n");
+        } else {
+            printf(" modified\n");
+        }
+    }
+}
+
+int main() {
+    Student students[MAX_STUDENTS] = {
+        {"10001", "11", "Zhang", 99.5, 88.5, 89.5, 277.5},
+        {"10002", "12", "Yang", 77.9, 56.5, 87.5, 221.9},
+        {"10003", "11", "Liang", 92.5, 99.0, 60.5, 252.0}
+    };
+    int studentCount = 3;
+
+    qsort(students, studentCount, sizeof(Student), compareStudents);
+
+    modifyStudent(students, &studentCount);
+    printStudents(students, studentCount);
+
+    return 0;
+}