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final_step.c

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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 total_score;
+} Student;
+
+Student students[MAX_STUDENTS];
+int student_count = 0;
+
+void display_menu();
+void input_students();
+void delete_student();
+void select_student();
+void order_students();
+void output_students();
+int compare_students(const void *a, const void *b);
+
+int main() {
+    char option;
+
+    while (1) {
+        display_menu();
+        printf("please input your option\n");
+        scanf(" %c", &option);
+
+        switch (option) {
+            case '1':
+                input_students();
+                break;
+            case '2':
+                delete_student();
+                break;
+            case '3':
+                select_student();
+                break;
+            case '4':
+                order_students();
+                break;
+            case '5':
+                output_students();
+                break;
+            case '6':
+                printf("Exiting the program.\n");
+                return 0;
+            default:
+                printf("Invalid option. Please try again.\n");
+        }
+    }
+    return 0;
+}
+
+void display_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");
+}
+
+void input_students() {
+    char cont[4];
+    do {
+        if (student_count >= MAX_STUDENTS) {
+            return;
+        }
+
+        printf("id ");
+        scanf("%s", students[student_count].id);
+        printf("class ");
+        scanf("%s", students[student_count].clas);
+        printf("name ");
+        scanf("%s", students[student_count].name);
+        printf("score1 ");
+        scanf("%lf", &students[student_count].score1);
+        printf("score2 ");
+        scanf("%lf", &students[student_count].score2);
+        printf("score3 ");
+        scanf("%lf", &students[student_count].score3);
+
+        students[student_count].total_score = students[student_count].score1 +
+                                              students[student_count].score2 +
+                                              students[student_count].score3;
+        student_count++;
+
+        printf("continue? ");
+        scanf("%s", cont);
+    } while (strcmp(cont, "yes") == 0);
+}
+
+void delete_student() {
+    char input[20];
+    char cont[4];
+    do{
+        scanf("%s", input);
+
+        int i, found = 0;
+        for (i = 0; i < student_count; i++) {
+            if (strcmp(students[i].id, input) == 0 || strcmp(students[i].name, input) == 0) {
+                found = 1;
+                break;
+            }
+        }
+
+        if (found) {
+            for (int j = i; j < student_count - 1; j++) {
+                students[j] = students[j + 1];
+            }
+            student_count--;
+        } else {
+            output_students();
+        }
+        printf("continue?\n");
+        scanf("%s",cont);
+    }while (strcmp(cont, "yes") == 0);
+}
+
+void select_student() {
+    char input[20];
+    scanf("%s", input);
+
+    int found = 0;
+    for (int i = 0; i < student_count; i++) {
+        if (strcmp(students[i].id, input) == 0 || strcmp(students[i].clas, input) == 0) {
+            found = 1;
+            printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",
+                   students[i].id,
+                   students[i].clas,
+                   students[i].name,
+                   students[i].score1,
+                   students[i].score2,
+                   students[i].score3,
+                   students[i].total_score);
+        }
+    }
+
+    if (!found) {
+        printf("there is no eligible student\n");
+    }
+}
+
+void order_students() {
+    qsort(students, student_count, sizeof(Student), compare_students);
+    printf("Students ordered successfully.\n");
+}
+
+void output_students() {
+    for (int i = 0; i < student_count; i++) {
+        printf("%s,%s,%s,%.1f,%.1f,%.1f,%.1f\n",
+               students[i].id,
+               students[i].clas,
+               students[i].name,
+               students[i].score1,
+               students[i].score2,
+               students[i].score3,
+               students[i].total_score);
+    }
+}
+
+int compare_students(const void *a, const void *b) {
+    Student *studentA = (Student *)a;
+    Student *studentB = (Student *)b;
+
+    int class_cmp = strcmp(studentA->clas, studentB->clas);
+    if (class_cmp != 0) {
+        return class_cmp;
+    }
+
+    if (studentA->total_score > studentB->total_score) {
+        return -1;
+    } else if (studentA->total_score < studentB->total_score) {
+        return 1;
+    }
+    return 0;
+}