USE OF FUNCTIONS & CONSTRUCTORS_ROBIN

import java.io.*;
class usesales
{
    public static void main(String args[]) throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        sales ob=new sales();
        sales ob1=new sales(001, "Robin", 3, 1000);
        System.out.println("Enter sales ID");
        int s=Integer.parseInt(br.readLine());
        System.out.println("Enter NAME");
        String n=br.readLine();
        System.out.println("Enter Quantity");
        int q=Integer.parseInt(br.readLine());
        System.out.println("Enter Price");
        int p=Integer.parseInt(br.readLine());
        ob.morning();
        ob.new_sales(s,n,q,p);
        ob.calcbill();
        int billret=ob.returnbill();
        String nameret=ob.returnname();
        System.out.println("The bill on your NAME: " +nameret+ " is =  " +billret);

        //now using the object created for parametrized constructor
        ob1.calcbill();
        billret=ob1.returnbill();
        nameret=ob1.returnname();
        System.out.println("The bill on your NAME: " +nameret+ " is =  " +billret);
    }
}
    
   

class sales
{
    int salesid;
    String name;
    int qty;
    int price;
    int bill;
   
    sales()
    {
        salesid=0;
        name="";
        qty=0;
        price=0;
    }
     sales(int sid, String n, int q, int p)
     {
        salesid=sid;
        name=n;
        qty=q;
        price=p;
    }
    void morning()
    {
        for(int i=1;i<=5;i++)
        {
            System.out.println("GOOD MORNING");
        }
    }
    void new_sales(int id, String nm, int qt, int pr)
    {
        salesid=id;
        name=nm;
        qty=qt;
        price=pr;
    }
    void calcbill()
    {
        bill=qty*price;
    }
    int returnbill()
    {
        return bill;
    }
    String returnname()
    {
        return name;
    }
}

OUTPUT:

Enter sales ID
007
Enter NAME
AMAN
Enter Quantity
10
Enter Price
500
GOOD MORNING
GOOD MORNING
GOOD MORNING
GOOD MORNING
GOOD MORNING
The bill on your NAME: AMAN is =  5000
The bill on your NAME: Robin is =  3000