Add looping the menu

real/README.md

@@ -0,0 +1,4 @@
+```shell
+gcc q1.c -o q1
+./q1
+```

real/q1.c

@@ -0,0 +1,275 @@
+#include "stdio.h"
+#include "stdlib.h"
+
+#define BUFFER_SIZE 128
+
+const char *FILE_STUDENT_DATA_PATH = "./students.txt";
+
+struct person_tag
+{
+    char name[20];
+    char id[10];
+};
+
+struct course_tag
+{
+    char course_name[20];
+    int no_of_units;
+    int marks[4];
+    float avg;
+};
+
+struct student_tag
+{
+    struct person_tag student_info;
+    struct course_tag course_info;
+    struct student_tag *next;
+} * head;
+
+// typedef for declared to use as data type
+typedef struct person_tag PERSON;
+typedef struct course_tag COURSE;
+typedef struct student_tag STUDENT;
+
+// core functions
+void display_students();
+void search_student();
+void find_maximum();
+void find_failed();
+void update_file();
+void read_file();
+void quite();
+
+// Linked list functions
+void add_student(char *student_name, char *student_id, char *course_name, int no_of_units, int *marks);
+int count();
+
+// util functions
+void display_menu();
+void read_student_to_data();
+void print_welcome();
+
+int main(void)
+{
+    // variable use for menu selected
+    int selected;
+
+    print_welcome();
+
+    display_menu();
+
+    printf("Enter your option: ");
+    scanf("%d", &selected);
+
+    switch (selected)
+    {
+    case 1:
+        display_students();
+        break;
+    case 2:
+        search_student();
+        break;
+    case 3:
+        find_maximum();
+        break;
+    case 4:
+        find_failed();
+        break;
+    case 5:
+        update_file();
+        break;
+    case 6:
+        quite();
+        break;
+    default:
+        printf("cannot find your option!");
+        break;
+    }
+}
+
+void print_welcome()
+{
+    printf("Welcome!\n");
+}
+
+void display_students()
+{
+    read_student_to_data();
+}
+
+void display_menu()
+{
+    printf("\n(1) Display students’ details\n");
+    printf("(2) Search for a student’s mark\n");
+    printf("(3) Find the details of student with the largest average\n");
+    printf("(4) Find the details of failed students\n");
+    printf("(5) Add new student to the record\n");
+    printf("(6) Quit program\n\n");
+}
+
+void add_student(char *student_name, char *student_id, char *course_name, int no_of_units, int *marks)
+{
+    STUDENT *temp, *iterator;
+    temp = (struct student_tag *)malloc(sizeof(struct student_tag));
+    PERSON info = {student_name, student_id};
+    COURSE course = {course_name, no_of_units, marks};
+    int sum = 0;
+    for (int i = 0; i < no_of_units; i++)
+    {
+        sum += marks[i];
+    }
+    course.avg = sum / no_of_units;
+    temp->student_info = info;
+    temp->course_info = course;
+    // reference in head
+    iterator = head;
+
+    if (head == NULL)
+    {
+        head = temp;
+        head->next = NULL;
+    }
+    else
+    {
+        while (iterator->next != NULL)
+        {
+            iterator = iterator->next;
+        }
+        temp->next = NULL;
+        iterator->next = temp;
+    }
+}
+
+void read_student_to_data()
+{
+    // init head to null
+    head = NULL;
+
+    FILE *file;
+    file = fopen(FILE_STUDENT_DATA_PATH, "r");
+
+    if (file == NULL)
+    {
+        printf("cannot read file: %s", FILE_STUDENT_DATA_PATH);
+        exit(EXIT_FAILURE);
+    }
+
+    char student_name[BUFFER_SIZE];
+    char student_id[BUFFER_SIZE];
+    char course_name[BUFFER_SIZE];
+    int no_of_units;
+    int marks[4];
+
+    int i;
+    while (!feof(file))
+    {
+        char no[BUFFER_SIZE];
+
+        fgets(student_name, sizeof student_name, file);
+        fgets(student_id, sizeof student_id, file);
+        fgets(course_name, sizeof course_name, file);
+        fgets(no, sizeof no, file);
+
+        i = 0;
+        while (student_name[i] != '\n')
+        {
+            i++;
+        }
+
+        student_name[i] = '\0';
+
+        i = 0;
+        while (student_id[i] != '\n')
+        {
+            i++;
+        }
+
+        student_id[i] = '\0';
+
+        i = 0;
+        while (course_name[i] != '\n')
+        {
+            i++;
+        }
+
+        course_name[i] = '\0';
+
+        printf("Student Name: %s\n", student_name);
+        printf("Student ID: %s\n", student_id);
+        printf("Course Name: %s\n", course_name);
+        printf("No of units: %s", no);
+
+        no_of_units = atoi(no);
+        for (int j = 0; j < no_of_units; j++)
+        {
+            char d[BUFFER_SIZE];
+
+            fgets(d, sizeof d, file);
+            sscanf(d, "%d", &marks[j]);
+        }
+
+        printf("Marks: [ ");
+        for (int x = 0; x < no_of_units; x++)
+        {
+            printf("%d ", marks[x]);
+        }
+        printf("]\n\n");
+
+        // add into linked list
+        add_student(student_name, student_id, course_name, no_of_units, marks);
+    }
+
+    fclose(file);
+}
+
+int count()
+{
+    int n = 1;
+    STUDENT *temp;
+    temp = head;
+    if (head == NULL)
+    {
+        return 0;
+    }
+
+    while (temp->next != NULL)
+    {
+        n++;
+        temp = temp->next;
+    }
+
+    return n;
+}
+
+void search_student()
+{
+    printf("\nNot implement yet!");
+}
+
+void find_maximum()
+{
+    printf("\nNot implement yet!");
+}
+
+void find_failed()
+{
+    printf("\nNot implement yet!");
+}
+
+void update_file()
+{
+    FILE *file;
+    file = fopen(FILE_STUDENT_DATA_PATH, "a");
+    printf("\nNot implement yet!");
+}
+
+void read_file()
+{
+    printf("\nNot implement yet!");
+}
+
+void quite()
+{
+    printf("\nGoodbye!");
+    exit(EXIT_SUCCESS);
+}

real/students.txt

@@ -0,0 +1,37 @@
+Jon
+1101825
+Computer
+4
+88
+98
+52
+95
+Peter
+112152
+Electrical
+3
+67
+40
+59
+Mary
+1201925
+Mechanical
+4
+78
+55
+79
+75
+Sherin
+1201925
+Civil
+4
+69
+53
+34
+88
+Jose
+34567
+Software
+2
+34
+56

work1/single.c

@@ -3,7 +3,7 @@
 
 #define BUFFER_SIZE 128
 
-const char *FILE_STUDENT_DATA_PATH = "./data/students.test.txt";
+const char *FILE_STUDENT_DATA_PATH = "./data/students.txt";
 
 struct person_tag
 {
@@ -58,6 +58,8 @@ int main(void)
 
     display_menu();
 
+    while (1)
+    {
         printf("Enter your option: ");
         scanf("%d", &selected);
         
@@ -86,6 +88,7 @@ int main(void)
             break;
         }
     }
+}
 
 void print_welcome()
 {
@@ -94,6 +97,7 @@ void print_welcome()
 
 void display_students()
 {
+    printf("\n");
     read_student_to_data();
 }