//********************************************************** // TEMPLATE FOR THE INVENTORY SYSTEM //********************************************************** //********************************************************** // CLASS NAME : Menu // DETAILS : THIS IS THE FIRST CLASS TO BE CALLED IN THE MAIN PROGRAM //********************************************************** class menu    // DECIDE WHICH MEMBER BECOMES PUBLIC OR PRIVATE {     void main_menu(void) ;     void edit_menu(void) ; } ; //********************************************************** // CLASS NAME : Product // DETAILS : THIS CLASS CONTAINS FUNCTIONS/METHODS  //              RELATED TO PRODUCT ITEMS //********************************************************** class product    // DECIDE WHICH MEMBER BECOMES PUBLIC OR PRIVATE { //minimum required functions     void add_item(void) ; //this function stores the product record in product.txt     void delete_item(void) ; //this function deletes a product record     void modify_item(void) ; //this function updates a product record     void display_item(void) ; //this function displays the product record                               // as a bonus, you may add a function to sort the records                               void purchase(void) ; //this function is for purchase transactions                           // and updates the product record     int find_item(int) ;  //this function finds a product record          /*            You can add features that would record every purchase made         which will be stored in purchase_record.txt         the file may contain info such as                      TransactionID    Item No.    Item Name            Cost     Purchased        Total         001                023            Electrical Tape     25.00     3                75.00         001                015            1" PVC Pipe            205      2              410.00         002                053         LED Bulb 9W            110.00     2                220.00                  You can also add a functon that can search and display a transaction record         from purchase_record.txt using the TransactionID     */       int itemcode ;      char itemname[30] ;     float itemprice ;     //this is lacking, you are expected to add the necessary variables } ; //********************************************************** // THIS FUNCTION SHOWS THE MAIN MENU AND CALLS OTHER FUNCTIONS //********************************************************** void menu :: main_menu(void) {     char ch ;     while (1)     {         cout <<"1: PURCHASE PRODUCTS" ;         cout <<"2: LIST OF PRODUCTS" ;         cout <<"3: SEARCH PRODUCT" ;         cout <<"4: EDIT PRODUCTS FILE" ;         cout <<"5: TRANSACTIONS REPORT" ;         cout <<"6: SEARCH TRANSACTION" ;         cout <<"0: QUIT" ;         cout <<"Enter Your Choice : " ;                  //your code     } } //********************************************************** // THIS FUNCTION SHOWS THE EDIT MENU AND CALLS OTHER FUNCTIONS //********************************************************** void menu :: edit_menu(void) {     char ch ;     while (1)     {         cout <<"1: ADD PRODUCTS" ;         cout <<"2: MODIFY PRODUCTS" ;         cout <<"3: DELETE PRODUCTS" ;         cout <<"0: EXIT" ;         cout <<"Enter Choice : " ;                          //your code     } } //*********************************************************** //    REMEMBER TO IMPLEMEMNT THIS PROJECT USING SEPARATE COMPILATION //    YOU ARE FREE TO DECIDE ON HOW TO SEPARATE YOUR CLASSES INTO  //    THEIR CORRESPONDING INTERFACE AND IMPLEMENTATION FILES //    provide proper comments wherever applicable //***********************************************************