Question
i have this java code but the for loop isnt working or looping can anyone fix it ? import java.util.Scanner; class shop { class invoice
i have this java code but the for loop isnt working or looping can anyone fix it ?
import java.util.Scanner;
class shop {
class invoice { int no; // the Invoice No String custName; // the Customer name int amount; // the Invoice Amount invoice next; // points to the next Invoice invoice previous;
invoice(int no, String custName, int amount) {
this.no = no;
this.custName = custName; this.amount=amount;
}
invoice() {
no = 0;
custName = ""; amount =0;
}
}
invoice head, tail;
int count;
public shop() { head=null; count = 0; invoice hNode = new invoice (); invoice tNode=new invoice(); hNode.next=tNode; head=hNode; tail=tNode;
} public void add(int no, String name, int amount){ if(head==null){ head=new invoice(no,name,amount); tail=head; } else{ invoice curr=head; while(curr.next!=null){ curr=curr.next; curr.next=new invoice(no,name,amount); tail=curr.next ; } } } public void delete(int no) {
if (head.next == tail) {
System.out.println("This invoice doesnt exist");
return;
}
invoice p = head;
Object item = p.no;
while (p != tail) {
if (p.no == no) {
p.next.previous = p.previous;
p.previous.next = p.next;
count--; } p = p.next;
}
} public void printinvoice() { invoice curr=head; while(curr!=null){ System.out.println(curr); curr=curr.next; } } int countinvoice(){ invoice curr=head; while(curr!=null){ count+=1; curr=curr.next; } return count; }
int sum(){ invoice curr=head; while(curr!=null){ count+=1; curr=curr.next; } return count; } public int countInvoice() {
return count;
}
} public class assignment{ public static void main(String[] args) { Scanner input= new Scanner(System.in); shop shop = new shop(); int n = 0; System.out.print("Enter the number of Invoices in the shop: "); n = input.nextInt(); while (n
int no = 0; String name; int amount = 0; for(int i = 1; i
System.out.print("Enter Customer Name: "); name = input.next();
System.out.print("Enter ammount: "); amount = input.nextInt(); while(amount
shop.add(no, name, amount); System.out.println(); } System.out.println();
System.out.println(" printing invoices "); shop.printinvoice(); System.out.println();
System.out.println("pritning number of invoices "); shop.countinvoice(); System.out.println(); int del; System.out.println("enter number of invoice to be deleted"); del=input.nextInt(); if(del!=n){ System.out.println("invoice doesnt exist"); } else{ shop.delete(del); System.out.println("invoice number"+del+"is deleted"); } System.out.println("Invoices count = " + shop.countInvoice());
} }
run: Enter the number of Invoices in the shop: 3 Enter No: 1 Enter Customer Name: do Enter ammount: 23Step by Step Solution
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