Conditional Constructs in Java

Chapter 9

Conditional Constructs in Java

Class 9 - Logix Kips ICSE Computer Applications with BlueJ

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Java Programs - Electricity Bill Calculation Using Slabs

The electricity board charges the bill according to the number of units consumed and the rate as given below:

Units Consumed	Rate Per Unit
First 100 units	80 Paisa per unit
Next 200 units	Rs. 1 per unit
Above 300 units	Rs. 2.50 per unit

Write a program in Java to accept the total units consumed by a customer and calculate the bill. Assume that a meter rent of Rs. 500 is charged from the customer.

Java

import java.util.Scanner;
 
public class ElectricityBill {
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter total units consumed: ");
        int units = sc.nextInt();
 
        double billAmount = 0;
        double meterRent = 500;
 
        if (units <= 100) {
            billAmount = units * 0.80;
        }
        else if (units <= 300) {
            billAmount = (100 * 0.80) + ((units - 100) * 1.00);
        }
        else {
            billAmount = (100 * 0.80) + (200 * 1.00) + ((units - 300) * 2.50);
        }
 
        double totalBill = billAmount + meterRent;
 
        System.out.println("\n--- Electricity Bill Details ---");
        System.out.println("Units Consumed : " + units);
        System.out.println("Energy Charges : Rs. " + billAmount);
        System.out.println("Meter Rent     : Rs. " + meterRent);
        System.out.println("Total Bill     : Rs. " + totalBill);
 
        sc.close();
    }
}

Output

Output 1 : 
SAMPLE INPUT : 
Enter total units consumed: 80

SAMPLE OUTPUT : 
--- Electricity Bill Details ---
Units Consumed : 80
Energy Charges : Rs. 64.0
Meter Rent     : Rs. 500.0
Total Bill     : Rs. 564.0

Output 2 : 
SAMPLE INPUT : 
Enter total units consumed: 250

SAMPLE OUTPUT : 
--- Electricity Bill Details ---
Units Consumed : 250
Energy Charges : Rs. 230.0
Meter Rent     : Rs. 500.0
Total Bill     : Rs. 730.0

Output 3 : 
SAMPLE INPUT : 
Enter total units consumed: 400

SAMPLE OUTPUT : 
--- Electricity Bill Details ---
Units Consumed : 400
Energy Charges : Rs. 530.0
Meter Rent     : Rs. 500.0
Total Bill     : Rs. 1030.0

Explanation

1. Input

Accepts the total units consumed.

2. Slab-wise Calculation

First 100 units

Charge = Units × 0.80

Next 200 units

Charge = (100 × 0.80) + (Remaining Units × 1.00)

Above 300 units

Charge = (100 × 0.80) + (200 × 1.00) + (Remaining Units × 2.50)

3. Meter Rent

A fixed charge of Rs. 500 is added.

4. Final Bill

Total Bill = Energy Charges + Meter Rent