import java.util.*;

public class ElectBill

{ //Creating Global Variables*/

int ConsumerNo; /* to store consumer no. globally*/

String ConsumerName; /* to store the name of the person*/

int PrevReading; /* to store previous reading globally*/

int CReading; /* to store current reading globally*/

String EBConn; /* to get the type of user*/

double Bill; /*to generate bill*/

void input_data() /*void function to take inputs from the user*/

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter Consumer Number: ");

ConsumerNo = sc.nextInt(); /*take input of consumer no.*/

System.out.println("Enter Consumer Name: ");

ConsumerName = sc.next(); /*take input of consumer name*/

System.out.println("Enter Previous Units: ");

PrevReading = sc.nextInt(); /*take input of previous reading*/

System.out.println("Enter Current Units:");

CReading = sc.nextInt(); /* take input of current reading*/

System.out.println("Enter the types of EB Connection(domestic or commercial)");

EBConn = sc.next(); /*take input of type of user*/

}

double calculate_bill() /* this is a return type double function for calculation of bill*/

{

int CurrReading; /* to take the diffrence between the previous reading and the current reading*/

CurrReading=CReading - PrevReading;

switch(EBConn) /* to charge according to choice */

{

case "domestic":

{if(CurrReading>=0 && CurrReading<=100) /*charge 1Rs if less than 100 units*/

Bill=CurrReading*1;

else if(CurrReading>100 && CurrReading <= 200) /*charge 2.50Rs if less than 200 units*/

Bill=(100*1)+((CurrReading-100)*2.50);

else if(CurrReading>200 && CurrReading <= 500) /* charge 4rs if less than 500 units*/

Bill=(100*1)+(100*2.50)+((CurrReading-200)*4);

else

Bill=(100*1)+(100*2.50)+(300*4)+((CurrReading-500)*6); /*charge 6rs if more than 500 units*/

break; }

case "commercial":

{ if(CurrReading>=0 && CurrReading<=100) /*charge 2Rs if less than 100 units*/

Bill=CurrReading*2;

else if(CurrReading>100 && CurrReading <= 200) /*charge 4.50Rs if less than 200 units*/

Bill=(100*2)+((CurrReading-100)*4.50);

else if(CurrReading>200 && CurrReading <= 500) /*charge 6rs if less than 500 units*/

Bill=(100*2)+(100*4.50)+((CurrReading-200)*6);

else

Bill=(100*2)+(100*4.50)+(300*6)+((CurrReading-500)*7); /*charge 7rs if less than 100 units*/

break; }

default: System.out.println("Wrong Entry Please Check!");

}

return Bill; /* will return the calculated to the global variable bill*/

}

void display() /* printing the outputs */

{

System.out.println("----------------------------------");

System.out.println("ELCTRICITY BILL");

System.out.println("----------------------------------");

System.out.println("Consumer Number: "+ConsumerNo);

System.out.println("Consumer Name: "+ConsumerName);

System.out.println("Consumer Previous Units: "+PrevReading);

System.out.println("Consumer Current Units: "+CReading);

System.out.println("Type of EBConnection: "+EBConn);

System.out.println("----------------------------------");

System.out.println("Total Amount(Rs.): "+Bill);

}

}

class ElectBillGen extends ElectBill /* class to call functions of another class */

{

public static void main (String[] args) /* main function to call the other member functions*/

{

ElectBill b=new ElectBill(); /* object created*/

b.input_data(); /* calling input function*/

b.calculate_bill(); /* calling this for bill calculation*/

b.display(); /* calling display function*/

}

}