Electircity bill counter | Program in java abut for bill

//Written in Java By Syed Ali Haider

//Student of The Hajvery University,Lahore, Pakistan.

//Don't remove these lines for legal use

//For more Please contact us.

package elect_bill;// package

import java.util.Scanner; // import

public class Bill { // class

      

       public static int calc (int units)

      

       { // calc function start from here

             

              if (units == 0) // if user enter zero

                     System.out.println("Something wrong....You enterZero.");

             

              else if (units <0) // if user enter negative value

                     System.out.println("Something wrong.......You ente a negative value.");

             

              else if (units <= 300) // if the units are less than 300

              {

                     int bill=(units*5) + 250;

                     return bill;

              }

             

              else if (units > 300) //if the units are more than 300

              {

                     int bill=(units*7) + 250;

                     return bill;

              }

             

              return 0;     // only for error handling purpose

              } // cals function end here

      

      

      

       public static void main(String[] args)

       {// main function start from here

      

              Scanner input = new Scanner (System.in);

             

              System.out.print("Please enter the unit comsumed: ");

              int unit=input.nextInt();

             

              int payable_bill=calc(unit);

      

       System.out.println("Your Payable bill is : Rs."+payable_bill);

input.close();      

             

              }// ending of main function

}// ending of class

//Written in Java By Syed Ali Haider

//Student of The Hajvery University,Lahore, Pakistan.

//Don't remove these lines for legal use

//For more Please contact us.