السلام علسكم ورحمة الله وبركاته
اريد اضافة فكره الي الكود هي(ان البائع يحذف عنصر مطلوب وبعد ذالك يحسب البرنامج التكلفه من جديد )))كيف اطبق هذا الفكره في الكود ؟؟؟
اريد اضافة الفكره في {case 3 }
import java.util.Scanner;
class Link
{
public int ID;
public int qui;
public String Items;
public int price; // data item
public Link next; // next link in list
// -------------------------------------------------------------
public Link(int a,int b,String Ite, int p) // constructor
{ ID = a;
qui=b; // constructor
Items = Ite;
price = p;
} // set to null)
// -------------------------------------------------------------
public void displayLink()
// display ourself
{
System.out.print("\t"+ID);
System.out.print("\t"+ qui);
System.out.print("\t"+ Items);
System.out.println("\t"+price);
}
public void dis()
{
System.out.println("\t voice " );
System.out.print("\t"+ Items);
System.out.println("\t"+price);
}
}
////////////////////////////////////////////////////////////////
class LinkList
{
private Link first; // ref to first link on list
// -------------------------------------------------------------
public LinkList() // constructor
{
first = null; // no links on list yet
}
// -------------------------------------------------------------
public boolean isEmpty() // true if list is empty
{
return (first==null);
}
// -------------------------------------------------------------
// insert at start of list
public void insertFirst(int ID,int SD, String Item, int pri)
{ // make new link
Link newLink = new Link(ID,SD, Item, pri);
newLink.next = first; // newLink --> old first
first = newLink; // first --> newLink
}
// -------------------------------------------------------------
public Link find(int key) // find link with given key
{ // (assumes non-empty list)
Link current = first; // start at 'first'
while(current.ID != key) // while no match,
{
if(current.next == null) // if end of list,
return null; // didn't find it
else // not end of list,
current = current.next; // go to next link
}
return current; // found it
}
///////////////////////////////////////
public Link delete(int key) // delete link with given key
{ // (assumes non-empty list)
Link current = first; // search for link
Link previous = first;
while(current.ID != key)
{
if(current.next == null)
return null; // didn't find it
else
{
previous = current; // go to next link
current = current.next;
}
} // found it
if(current == first) // if first link,
first = first.next; // change first
else // otherwise,
previous.next = current.next; // bypass it
return current;
}
// -------------------------------------------------------------
public void displayList()
{
System.out.print("\t\tthe menue of our canteen \n");
System.out.println("\tID\tQuin\tItem name\tprice " );
Link current = first; // start at beginning of list
while(current != null) // until end of list,
{
current.displayLink(); // print data
current = current.next; // move to next link
}
System.out.println("");
}
// -------------------------------------------------------------
} // end class LinkList
////////////////////////////////////////////////////////////////
class LinkListApp
{
public static void main(String[] args)
{
LinkList theList = new LinkList(); // make new list
theList.insertFirst(4,44,"moka",7);
theList.insertFirst(3,32,"cappuccino",3);
theList.insertFirst(2,55,"Burger",4);
theList.insertFirst(1,67,"french fries", 5);
theList.displayList();
Scanner input=new Scanner(System.in);
String password;
System.out.println( "Please enter your password ");
do
{
password=input.nextLine();
if(password.equals("hello"))
System.out.println("correct");
else
{
System.out.println("wrong");
System.out.println("pleas tray again");
}
}while(!password.equals("hello"));
// display list
// end main()
while(true)
{ System.out.println("Enter number to:\n");
System.out.println("1)show the minu for seller
");
System.out.println("2)selecte the name of items and calculating the price\n");
System.out.println("3)delet items after the order \n");
System.out.println("4)display the invoice\n");
int num=input.nextInt(); // get user's option
switch(num)
{
case 1: // show list
if( !theList.isEmpty() )
theList.displayList();
else
System.out.println("List is empty");
break;
case 2:
// search //caculate totale
int t=0;
int e=0;
System.out.println("Enter how many items u want ");
int a=input.nextInt();
for(int j=1;j<=a;j++)
{
System.out.println("Enter"+j+"item");
int b=input.nextInt();
Link f = theList.find( b);
// find item
if( f != null)
{
System.out.println("Found link with key " + f.ID);
e= f.qui-1;
System.out.println("\nQuintity of "+f.Items+"is"+e);
t+= f.price;
}
else
{
System.out.println("Can't find link");
}
}
System.out.println("\nprice ="+t);
break;
case 3:
//delet
int h=0;
System.out.println("Enter price to deldt items");
int key=input.nextInt();
Link i = theList.delete(key); // delete item
if( i != null )
System.out.println("Deleted link with key " + i.ID+i.qui+i.Items+i.price);
else
System.out.println("Can't delete link");
System.out.println("price after delet"+h);
System.out.println("Do you want to delen other items:enter 1 to delet no press 0 ");
int s=input.nextInt();
if(s==1)
{
System.out.println("Enterthe number of item to delet");
int g=input.nextInt();
Link q = theList.delete(g); // delete item
if( q != null )
System.out.println("Deleted link with key " + q.ID+q.qui+q.Items+q.price);
else
System.out.println("Can't delete link");
}
else
if(s==0)
System.out.println("*******************");
theList.displayList();
break;
case 4:
System.out.println("\t enter the number of invoice " );
int x=input.nextInt();
for(int j=0;j<x;j++)
break;
default:
System.out.println("Invalid entry");
} // end switch
} // end while
} // end main()
//--------------------------------------------------------------
//------------------------------------------------------------
}
