Updated for search by key and id

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "typeinfo": "c"
+    }
+}

data/students.test.txt

@@ -6,24 +6,3 @@ Computer
 98
 52
 95
-SS
-323
-SC
-3
-2
-4
-2
-Sambo2
-73823
-MSK2
-3
-3
-54
-2
-SS
-SS3
-212
-3
-5
-3
-2

work1/single.c

@@ -1,8 +1,10 @@
 #include "stdio.h"
 #include "stdlib.h"
+#include "string.h"
 
 #define BUFFER_SIZE 128
 #define MAX_NO_OF_UNITS 4
+#define NAME_SIZE 20
 
 const char *FILE_STUDENT_DATA_PATH = "./data/students.test.txt";
 
@@ -36,6 +38,8 @@ typedef struct student_tag STUDENT;
 void display_menu();
 void print_welcome();
 void print_student(STUDENT *student);
+void release(STUDENT *data);
+STUDENT *search_student_by_name_or_id(char search_key[NAME_SIZE]);
 
 // core functions
 void display_students();
@@ -100,13 +104,9 @@ void print_welcome()
 
 void display_students()
 {
-    printf("\n");
-
     read_file();
 
-    STUDENT *student;
+    STUDENT *student = head;
-
-    student = head;
 
     if (student == NULL)
     {
@@ -114,20 +114,15 @@ void display_students()
         return;
     }
 
-    printf("\n================ Student Details ================\n");
-
     print_student(student);
-
-    while (student->next != NULL)
-    {
-        printf("\n");
-        student = student->next;
-        print_student(student);
-    }
 }
 
 void print_student(STUDENT *student)
 {
+    printf("\n================ Student Details ================\n");
+    while (student != NULL)
+    {
+        printf("\n");
         printf("Student Name: %s\n", student->student_info.name);
         printf("Student ID: %s\n", student->student_info.id);
         printf("Course Name: %s\n", student->course_info.course_name);
@@ -140,6 +135,13 @@ void print_student(STUDENT *student)
         }
         printf("]\n");
         printf("Avg: %.2f\n", student->course_info.avg);
+        student = student->next;
+    }
+
+    // clean up the memory
+    // after output the data
+    // because we don;t need it anymore after output
+    release(student);
 }
 
 void display_menu()
@@ -157,11 +159,11 @@ void add_student(char student_name[20], char student_id[10], char course_name[20
     STUDENT *temp, *iterator;
     temp = (struct student_tag *)malloc(sizeof(struct student_tag));
     PERSON info;
-    strncpy(info.name, student_name, 20);
+    memcpy(info.name, student_name, 20);
-    strncpy(info.id, student_id, 10);
+    memcpy(info.id, student_id, 10);
 
     COURSE course;
-    strncpy(course.course_name, course_name, 20);
+    memcpy(course.course_name, course_name, 20);
     course.no_of_units = no_of_units;
     // memcpy(course.marks, marks);
 
@@ -215,7 +217,36 @@ int count()
 
 void search_student()
 {
-    printf("\nNot implement yet!");
+    char search_key[NAME_SIZE];
+
+    printf("Enter student name or id to search: ");
+    scanf("%s", &search_key);
+
+    STUDENT *found_student = search_student_by_name_or_id(search_key);
+    if (found_student == NULL)
+    {
+        printf("No student found!");
+        return;
+    }
+
+    print_student(found_student);
+}
+
+STUDENT *search_student_by_name_or_id(char search_key[NAME_SIZE])
+{
+    STUDENT *temp = head;
+
+    while (temp != NULL)
+    {
+        if (strcmp(temp->student_info.name, search_key) == 0 || strcmp(temp->student_info.id, search_key) == 0)
+        {
+            printf("\nSearch found with key: %s\n", search_key);
+            return temp;
+        }
+        temp = temp->next;
+    }
+
+    return NULL;
 }
 
 void find_maximum()
@@ -252,9 +283,9 @@ again:
     printf("Enter no of units: ");
     scanf("%d", &no_of_units);
 
-    if (no_of_units > MAX_NO_OF_UNITS)
+    if (no_of_units > MAX_NO_OF_UNITS && no_of_units <= 0)
     {
-        printf("you cannot input the units bigger than %d\n", MAX_NO_OF_UNITS);
+        printf("you cannot input the units bigger than %d or less than 0\n", MAX_NO_OF_UNITS);
         getchar();
         goto again;
     }
@@ -294,10 +325,10 @@ again:
 
 void read_file()
 {
-    // free the nodes
+    // release nodes
-    // because it can be use in memory
+    // we need to clean up the memory
-    // we need to clear it first
+    if (head != NULL)
-    // before we re-initailize the new data
+    {
         STUDENT *temp;
         while (head != NULL)
         {
@@ -305,6 +336,7 @@ void read_file()
             head = head->next;
             free(temp);
         }
+    }
 
     FILE *file;
     file = fopen(FILE_STUDENT_DATA_PATH, "r");
@@ -376,3 +408,23 @@ void quite()
     printf("\nGoodbye!");
     exit(EXIT_SUCCESS);
 }
+
+void release(STUDENT *data)
+{
+    if (data == NULL)
+    {
+        return;
+    }
+
+    // free the nodes
+    // because it can be use in memory
+    // we need to clear it first
+    // before we re-initailize the new data
+    STUDENT *temp;
+    while (data != NULL)
+    {
+        temp = data;
+        data = data->next;
+        free(temp);
+    }
+}