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step_one_menu.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+    char id[20];
+    char clas[20];
+    char name[20];
+    double score1, score2, score3, total, average;
+} Student;
+
+void displayMenu();
+void inputStudents(Student students[], int *count);
+void outputStudents(Student students[], int count);
+void sortStudents(Student students[], int count);
+void insertStudent(Student students[], int *count);
+void deleteStudent(Student students[], int *count);
+void modifyStudent(Student students[], int count);
+void queryStudent(Student students[], int count);
+
+int main() {
+    Student students[100];
+    int count = 0;
+    char option;
+
+    while (1) {
+        displayMenu();
+        printf("Please input your option: ");
+        scanf(" %c", &option);
+
+        switch (option) {
+            case '1':
+                inputStudents(students, &count);
+                break;
+            case '2':
+                deleteStudent(students, &count);
+                break;
+            case '3':
+                queryStudent(students, count);
+                break;
+            case '4':
+                sortStudents(students, count);
+                outputStudents(students, count);
+                break;
+            case '5':
+                outputStudents(students, count);
+                break;
+            case '6':
+                printf("Exiting system...\n");
+                return 0;
+            default:
+                printf("Invalid option. Try again.\n");
+        }
+    }
+    return 0;
+}
+
+void displayMenu() {
+    printf("\n1. Input\n");
+    printf("2. Delete\n");
+    printf("3. Select\n");
+    printf("4. Order\n");
+    printf("5. Output\n");
+    printf("6. Quit\n");
+}
+
+void inputStudents(Student students[], int *count) {
+    char cont = 'y';
+    while (cont == 'y') {
+        printf("ID: ");
+        scanf("%s", students[*count].id);
+        printf("Class: ");
+        scanf("%s", students[*count].clas);
+        printf("Name: ");
+        scanf("%s", students[*count].name);
+        printf("Score1: ");
+        scanf("%lf", &students[*count].score1);
+        printf("Score2: ");
+        scanf("%lf", &students[*count].score2);
+        printf("Score3: ");
+        scanf("%lf", &students[*count].score3);
+
+        students[*count].total = students[*count].score1 + students[*count].score2 + students[*count].score3;
+        students[*count].average = students[*count].total / 3.0;
+        (*count)++;
+
+        printf("Continue? (y/n): ");
+        scanf(" %c", &cont);
+    }
+}
+
+void outputStudents(Student students[], int count) {
+    for (int i = 0; i < 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);
+    }
+}
+
+void sortStudents(Student students[], int count) {
+    for (int i = 0; i < count - 1; i++) {
+        for (int j = i + 1; j < count; j++) {
+            if (strcmp(students[i].clas, students[j].clas) > 0 || 
+                (strcmp(students[i].clas, students[j].clas) == 0 && students[i].total < students[j].total)) {
+                Student temp = students[i];
+                students[i] = students[j];
+                students[j] = temp;
+            }
+        }
+    }
+}
+
+void insertStudent(Student students[], int *count) {
+    Student newStudent;
+    printf("ID: ");
+    scanf("%s", newStudent.id);
+    printf("Class: ");
+    scanf("%s", newStudent.clas);
+    printf("Name: ");
+    scanf("%s", newStudent.name);
+    printf("Score1: ");
+    scanf("%lf", &newStudent.score1);
+    printf("Score2: ");
+    scanf("%lf", &newStudent.score2);
+    printf("Score3: ");
+    scanf("%lf", &newStudent.score3);
+
+    newStudent.total = newStudent.score1 + newStudent.score2 + newStudent.score3;
+    newStudent.average = newStudent.total / 3.0;
+
+    for (int i = *count; i > 0; i--) {
+        if (strcmp(students[i - 1].clas, newStudent.clas) < 0 || 
+            (strcmp(students[i - 1].clas, newStudent.clas) == 0 && students[i - 1].total > newStudent.total)) {
+            students[i] = students[i - 1];
+        } else {
+            students[i] = newStudent;
+            (*count)++;
+            return;
+        }
+    }
+    students[0] = newStudent;
+    (*count)++;
+}
+
+void deleteStudent(Student students[], int *count) {
+    char idOrName[20];
+    printf("Enter ID or Name to delete: ");
+    scanf("%s", idOrName);
+
+    for (int i = 0; i < *count; i++) {
+        if (strcmp(students[i].id, idOrName) == 0 || strcmp(students[i].name, idOrName) == 0) {
+            for (int j = i; j < *count - 1; j++) {
+                students[j] = students[j + 1];
+            }
+            (*count)--;
+            printf("Student deleted.\n");
+            return;
+        }
+    }
+    printf("Student not found.\n");
+}
+
+void modifyStudent(Student students[], int count) {
+    char id[20];
+    printf("Enter ID to modify: ");
+    scanf("%s", id);
+
+    for (int i = 0; i < count; i++) {
+        if (strcmp(students[i].id, id) == 0) {
+            printf("New ID: ");
+            scanf("%s", students[i].id);
+            printf("New Class: ");
+            scanf("%s", students[i].clas);
+            printf("New Name: ");
+            scanf("%s", students[i].name);
+            printf("New Score1: ");
+            scanf("%lf", &students[i].score1);
+            printf("New Score2: ");
+            scanf("%lf", &students[i].score2);
+            printf("New Score3: ");
+            scanf("%lf", &students[i].score3);
+
+            students[i].total = students[i].score1 + students[i].score2 + students[i].score3;
+            students[i].average = students[i].total / 3.0;
+            printf("Student modified.\n");
+            return;
+        }
+    }
+    printf("Student not found.\n");
+}
+
+void queryStudent(Student students[], int count) {
+    char query[20];
+    printf("Enter query (ID/Class/Name): ");
+    scanf("%s", query);
+
+    for (int i = 0; i < count; i++) {
+        if (strstr(students[i].id, query) || strstr(students[i].clas, query) || strstr(students[i].name, query)) {
+            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);
+        }
+    }
+}