Okay, I spent all this time making this for class but I have one thing that I can't quite get: I need this to sentinel loop continuously (exiting upon entering x) so that the

 System.out.println("What type of Employee? Enter 'o' for Office " +
 "Clerical, 'f' for Factory, or 's' for Saleperson.  Enter 'x' to exit." ); 

line comes back up after they enter the first round of information. Also, I can't leave this up long on the (very) off chance a classmate might see this and steal the code. Full code following:

import java.util.Scanner;
public class Project1 {

public static void main (String args[]){

Scanner inp = new Scanner( System.in );
double totalPay;

System.out.println("What type of Employee? Enter 'o' for Office " +
"Clerical, 'f' for Factory, or 's' for Saleperson.  Enter 'x' to exit." );  
String response= inp.nextLine();



while (!response.toLowerCase().equals("o")&&!response.toLowerCase().equals("f")
&&!response.toLowerCase().equals("s")&&!response.toLowerCase().equals("x")){


System.out.print("\nInvalid selection,please enter your choice again:\n");
    response=inp.nextLine();

}

 char choice = response.toLowerCase().charAt( 0 );



 switch (choice){

case 'o':  
     System.out.println("Enter your hourly rate:");
     double officeRate=inp.nextDouble();
     System.out.println("Enter the number of hours worked:");
     double officeHours=inp.nextDouble();
     totalPay = officeCalc(officeRate,officeHours);
     taxCalc(totalPay);
     break;      
case 'f': 
     System.out.println("How many Widgets did you produce during the week?");
     double widgets=inp.nextDouble();
     totalPay=factoryCalc(widgets);
     taxCalc(totalPay);
     break;
case 's':
     System.out.println("What were your total sales for the week?");
     double totalSales=inp.nextDouble();
     totalPay=salesCalc(totalSales);
     taxCalc(totalPay);
     break;

}

 }


 public static double taxCalc(double totalPay){

double federal=totalPay*.22;

double state  =totalPay*.055;

double netPay = totalPay - federal - state;

federal =federal*Math.pow(10,2);
federal =Math.round(federal);
federal= federal/Math.pow(10,2);
state =state*Math.pow(10,2);
state =Math.round(state);
state= state/Math.pow(10,2);
totalPay =totalPay*Math.pow(10,2);
totalPay =Math.round(totalPay);
totalPay= totalPay/Math.pow(10,2);
netPay =netPay*Math.pow(10,2);
netPay =Math.round(netPay);
netPay= netPay/Math.pow(10,2);

System.out.printf("\nTotal Pay \t: %1$.2f.\n", totalPay);
System.out.printf("State W/H \t: %1$.2f.\n", state);
System.out.printf("Federal W/H : %1$.2f.\n", federal);
System.out.printf("Net Pay \t: %1$.2f.\n", netPay);

    return totalPay;

}

 public static double officeCalc(double officeRate,double officeHours){


double overtime=0;
if  (officeHours>=40)
    overtime = officeHours-40;
else 
    overtime = 0;
if  (officeHours >= 40)
    officeHours = 40;
double otRate = officeRate * 1.5;

double totalPay= (officeRate * officeHours) + (otRate*overtime);

    return totalPay;

} public static double factoryCalc(double widgets){

double totalPay=widgets*.35 +300;

    return totalPay;
}
 public static double salesCalc(double totalSales){

double totalPay = totalSales * .05 + 500;

    return totalPay;

} }