Beginner needs help, simple do-while

Question

Need some help whit this code, how can I get this do-while loop to work?
I use a simple gui where a decimal number is been read in, and some calculations beeing done.
I want the user to decide if he/she wants to exit or not.
But I dont now how I shall use it when using the boolean type.
Tanks in advance.
I'm sorry about my bad english!
import mittBibliotek.*;
class nettopris{
     static final double moms = 1.24;
     static final double rabatt = .85;
     public static void main (String[] args){
          do{
               JavabokGUI gui = new JavabokGUI("Legger til moms");
               gui.show();
               double pris = gui.lesDesimaltall("","Skriv inn nettopris: ");
               if (pris>2000){
                    double rabattPris=bergenNypris(pris);
                    double brutto = beregnBruttopris(rabattPris);
                    double rabattbel?p= beregnRabbattBel?p(pris,rabattPris);
                    gui.skrivResultater("Nettopris - 15% rabatt : " +rabattPris);
                    gui.skrivResultater("Prisen inkl. mva : " +brutto);
                    gui.skrivResultater("Rabatt bel?pet er : " +rabattbel?p);
                    gui.skrivResultater("Mva bel?pet er : "+beregnMvabel?p(brutto,rabattPris));
               }else{
                    double brutto= beregnBruttopris(pris);
                    double avrundetPris= avrunding(brutto);
                    gui.skrivResultater("Prisen inkl mva (avrundet): " +avrundetPris);
                    gui.skrivResultater("Mva bel?pet er (avrundet): " +beregnMvabel?p(avrundetPris,pris));
               }// end if else
               boolean svar = gui.jaSvar("","Ny beregning? ");// GUI  yes/no.Where yes is true.If true looping until false
}while  (svar == true) ;// error: cannot resolve symbol, variabel svar
     }// main
     static double beregnBruttopris(double prisen){
          double brutto= prisen * moms;
          return brutto;
     }//Brutto
     static double avrunding(double bruttopris){
          int avrundet= (int) (bruttopris + 0.5);
          return avrundet;
     }// Avrundet
     static double bergenNypris(double nyprisen){
          nyprisen = nyprisen * rabatt;
          return nyprisen;
     }// Nyprisen
     static double beregnRabbattBel?p(double pris, double rabatt){
          double rabbel?p = pris - rabatt;
          return rabbel?p;
     }// Rabatt bel?p
     static double beregnMvabel?p(double brutton, double rabattPrisen){
          double mvaBel?p = brutton - rabattPrisen;
          return mvaBel?p;
     }// Mvabel?p
} // class nettopris

Answer 1

If your only problem is with the variable svar, just put a line:
boolean svar = true;before the "do" line and change the line:
boolean svar = gui.jaSvar("","Ny beregning? ");to:
svar = gui.jaSvar("","Ny beregning? ");Your problem has to do with variable scope. Since you declare the variable svar inside the braces {} of the do loop, it doesn't exist for the while test.