fix bugs and some cleanup

inv_control.h

@@ -15,7 +15,7 @@ void inv_control(){
         	"List(allow all operation include add)",
         	"Add item(shortcut to add item)"
 		};
-        choice = choices_selecter(items,2,NULL);
+        choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\nInventory control\n");
         switch (choice){
             case 1:;//list
                 //add a new element with product name new item

normal_user.h

@@ -31,7 +31,7 @@ void normal_menu(){
         	"Search item",
         	"Self help sale system"
 		};
-		choice = choices_selecter(items,3,"><Welcome to the Student Union POS system><\nNormal User Menu");
+		choice = choices_selecter(items,3,"><Welcome to the Student Union POS system><\nNormal User Menu\n");
         switch (choice)
         {
             case 1://List items
@@ -86,7 +86,7 @@ void search_item(){
     char * items[] = {
     	"search"
 	};
-    breakout = choices_selecter(items,1,"><Welcome to the Student Union POS system><");
+    breakout = choices_selecter(items,1,"><Welcome to the Student Union POS system><\n");
     if(breakout == 2){
         break;
     }
@@ -160,7 +160,7 @@ void self_help_sale_system(){
     	"scan barcode",
     	"cart/checkout"
 	};
-    choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><");
+    choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\n");
     switch (choice)
     {
     case 1:

role_control.h

@@ -1,7 +1,6 @@
 
 //role control
 void add_role();
-void list_role();
 void print_role(struct linkedlist* list,int cur,int end,struct Map* map);
 void showRole(struct linkedlist* list,int index);
 struct Map* sortRole(struct linkedlist* list,int choice);
@@ -14,9 +13,9 @@ void role_control(){
         	"add admin role",
         	"list role"
 		};
-        choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\nRole control");
+        choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\nRole control\n");
         switch (choice){
-            case 0:
+            case 3:
                 break;
             case 1:
                 add_role();
@@ -27,13 +26,13 @@ void role_control(){
                     "role",
                 };
                 void * list = getLinkedList(role_list_db(),0);
-                // lister(list,NULL,sizeofLinkedlist(list),"Role",SortItems,2,print_role,sortRole,showRole);
+                lister(list,NULL,sizeofLinkedlist(list),"Role",SortItems,2,print_role,sortRole,showRole);
-                list_role(db);
+                //warning appears but can be ignore due to the fact that they are just pointer, no difference 
                 break;
             default:
                 break;
         }
-    }while(choice != 0);
+    }while(choice != 3);
 }
 
 
@@ -57,85 +56,6 @@ void add_role(){
     return;
 }
 
-
-
-void list_role(){
-    struct linkedlist* list = getLinkedList(role_list_db(),0);
-    int list_size = sizeofLinkedlist(list);
-    int choice = -1;
-    int page = 0;
-    int page_size = PAGE_SIZE;
-    int total_pages = ceil( (double)list_size / page_size);
-    struct Map* map = NULL;    
-    //list role
-    do{
-        Cls();
-        welcome_message();
-        printf("Role list\n");
-        printf("0 exit\n");
-        printf("1 sort admin ascending\n");
-        printf("2 sort admin descending\n");
-        printf("3 sort role ascending\n");
-        printf("4 sort role descending\n");
-        if(page+1 == total_pages){
-            print_role(list,page*page_size,list_size,map);
-        }else{
-            print_role(list,page*page_size,(page+1)*page_size,map);
-        }
-        //page control
-        int current_page_size = page_size+2;
-        if(page+1 == total_pages){
-            current_page_size = list_size - page*page_size + 4;
-        }
-        printf("%d next page\n",current_page_size+1);
-        printf("%d previous page\n",current_page_size+2);
-        printf("%d set page size\n",current_page_size+3);
-        printf("%d/%d/%d(page size/page number/total)\n",page_size,page+1,total_pages);
-
-        bool valid = true;
-        do{
-            valid = true;
-            printf("Please input your choice\n>");
-            fflush_stdin();
-            scanf("%d", &choice);
-            if(choice <=4 && choice > 0){
-                printf("sorting...\n");
-                map = sortRole(list,choice);
-            }else if(choice == current_page_size+1){
-                if(page + 1 < total_pages){
-                page++;
-                }else{
-                    printf("Already at last page\n");
-                    valid = false;
-                }
-            }else if(choice == current_page_size+2){
-                if(page > 0){
-                    page--; 
-                }else{
-                    printf("Already at first page\n");
-                    valid = false;
-                }
-            }else if(choice == current_page_size+3){
-                printf("Enter page size: ");
-                fflush_stdin();
-                scanf("%d", &page_size);
-                total_pages = ceil( (double)list_size / page_size);
-                page = 0;
-
-            }else if(choice >= 5 && choice <= current_page_size){
-                if(map == NULL){
-                    showRole(list,choice - 5 + page_size*page);
-                }else{
-                    showRole(list,map[choice - 5 + page_size*page].key);
-                }
-            }else if(choice != 0){
-                printf("Invalid choice\n");
-                valid = false;
-            }
-        }while(!valid);
-    }while(choice != 0);
-}
-
 void print_role(struct linkedlist* list,int cur,int end,struct Map* map){
     printf("%-10s%-10s%-10s\n","No.","Role","Admin?");
     if(map == NULL){

tran_control.h

@@ -12,7 +12,7 @@ void tran_control(){
 		"List transaction",
 		"new transaction"
 		};
-        choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\nTransaction control");
+        choice = choices_selecter(items,2,"><Welcome to the Student Union POS system><\nTransaction control\n");
         switch(choice){
              case 1:
                 char * SortItems[] = {

user_control.h

@@ -10,13 +10,10 @@ void user_control(){
     int choice = 0;
     while(choice != 3){
         Cls();
-        printf("User Control\n");
+        choice = choices_selecter((char*[]){
-        printf("1. Add User(shortcut)\n");
+            "Add user",
-        printf("2. List User\n");
+            "List user",
-        printf("3. Exit\n");
+        },3,"><Welcome to the Student Union POS system><\nUser control\n");
-        printf("Please input your choice\n>");
-        fflush_stdin();
-        scanf("%d",&choice);
         switch(choice){
             case 1:
                 db = add_user(db);