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8.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_STUDENT_NUM 100
+
+struct Student {
+    char* id;
+    char* clas;
+    char* name;
+    double score1;
+    double score2;
+    double score3;
+    double score;
+};
+
+struct Student stu[MAX_STUDENT_NUM];
+int stu_num = 0;
+
+void print_menu() {
+    printf("1.input\n");
+    printf("2.delete\n");
+    printf("3.select\n");
+    printf("4.order\n");
+    printf("5.output\n");
+    printf("6.quit\n");
+    printf("please input your option\n");
+}
+
+void add_student() {
+    while (1) {
+        printf("Id ");
+        stu[stu_num].id = (char*)malloc(sizeof(char) * 20);
+        scanf("%s", stu[stu_num].id);
+        printf("class ");
+        stu[stu_num].clas = (char*)malloc(sizeof(char) * 20);
+        scanf("%s", stu[stu_num].clas);
+        printf("name ");
+        stu[stu_num].name = (char*)malloc(sizeof(char) * 20);
+        scanf("%s", stu[stu_num].name);
+        printf("score1 ");
+        scanf("%lf", &stu[stu_num].score1);
+        printf("score2 ");
+        scanf("%lf", &stu[stu_num].score2);
+        printf("score3 ");
+        scanf("%lf", &stu[stu_num].score3);
+        stu[stu_num].score = stu[stu_num].score1 + stu[stu_num].score2 + stu[stu_num].score3;
+        stu_num++;
+        printf("continue? ");
+        char answer[10];
+        scanf("%s", answer);
+        if (strcmp(answer, "no") == 0) {
+            break;
+        }
+    }
+}
+
+void delete_student() {
+    int i, j;
+    while (1) {
+        printf("input student id or name to delete\n");
+        char query[20];
+        scanf("%s", query);
+        int deleted = 0;
+        for (i = 0; i < stu_num; i++) {
+            if (strcmp(query, stu[i].id) == 0 || strcmp(query, stu[i].name) == 0) {
+                free(stu[i].id);
+                free(stu[i].clas);
+                free(stu[i].name);
+                for (j = i; j < stu_num - 1; j++) {
+                    stu[j] = stu[j + 1];
+                }
+                stu_num--;
+                deleted = 1;
+                i--;
+            }
+        }
+        if (!deleted) {
+            printf("no such student\n");
+        }
+        else {
+            for (i = 0; i < stu_num; i++) {
+                printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
+            }
+        }
+        printf("continue? ");
+        char answer[10];
+        scanf("%s", answer);
+        if (strcmp(answer, "no") == 0) {
+            break;
+        }
+    }
+}
+
+void select_student() {
+    int i;
+    while (1) {
+        printf("input student id or class to select\n");
+        char query[20];
+        scanf("%s", query);
+        double sum_score1 = 0.0, sum_score2 = 0.0, sum_score3 = 0.0, sum_score = 0.0;
+        int count = 0;
+        for (i = 0; i < stu_num; i++) {
+            if (strcmp(query, stu[i].id) == 0 || strcmp(query, stu[i].clas) == 0) {
+                sum_score1 += stu[i].score1;
+                sum_score2 += stu[i].score2;
+                sum_score3 += stu[i].score3;
+                sum_score += stu[i].score;
+                count++;
+            }
+        }
+        if (count == 0) {
+            printf("no such student\n");
+        }
+        else {
+            printf("average score1: %.1lf\n", sum_score1 / count);
+            printf("average score2: %.1lf\n", sum_score2 / count);
+            printf("average score3: %.1lf\n", sum_score3 / count);
+            printf("average score: %.1lf\n", sum_score / count);
+        }
+        printf("continue? ");
+        char answer[10];
+        scanf("%s", answer);
+        if (strcmp(answer, "no") == 0) {
+            break;
+        }
+    }
+}
+void order_student() {
+    int i, j;
+    while (1) {
+        printf("input 1 to order by id or 2 to order by score\n");
+        int order_type;
+        scanf("%d", &order_type);
+        if (order_type != 1 && order_type != 2) {
+            printf("invalid order type\n");
+            continue;
+        }
+        for (i = 0; i < stu_num; i++) {
+            for (j = i + 1; j < stu_num; j++) {
+                if ((order_type == 1 && strcmp(stu[i].id, stu[j].id) > 0) ||
+                    (order_type == 2 && stu[i].score < stu[j].score)) {
+                    struct Student temp = stu[i];
+                    stu[i] = stu[j];
+                    stu[j] = temp;
+                }
+            }
+        }
+        for (i = 0; i < stu_num; i++) {
+            printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
+        }
+        printf("continue? ");
+        char answer[10];
+        scanf("%s", answer);
+        if (strcmp(answer, "no") == 0) {
+            break;
+        }
+    }
+}
+
+void output_student() {
+    int i;
+
+
+    for (i = 0; i < stu_num; i++) {
+        printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
+    }
+
+}
+
+int main() {
+    while (1) {
+        print_menu();
+        int option;
+        scanf("%d", &option);
+        switch (option) {
+        case 1:
+            add_student();
+            break;
+        case 2:
+            delete_student();
+            break;
+        case 3:
+            select_student();
+            break;
+        case 4:
+            order_student();
+            break;
+        case 5:
+            output_student();
+            break;
+        case 6:
+            printf("goodbye!\n");
+            exit(0);
+        default:
+            printf("invalid option\n");
+            break;
+        }
+    }
+    return 0;
+}