Resolving some errors

I have the following code for an assignment. Yes, this is for a class, so I don't want the answer given to me but I have searched the code over and I can't come up with anything. A nudge in the right direction would be great.

Code:

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public class Loan {

          public float P;
          public float I;
          public float Ia;
          public int Nyr;
      public int Nprd;

          public void setP() {
                  P = 200000;
          }
          public void setI() {
                  I = 5.75f;
                  Ia = I/(12*100);
          }
          public void setN() {
                  Nyr = 30;
                  Nprd = Nyr*12;
          }

          public void CalcTbl() {
                  float Pa;
            int Pc; //current period num
            float M;  //monthly payment
            float Mi; //interest paid
            float Mp; //principal paid
                  Pa = P;
                  Pc = 0;

                  for(int Npa = Nprd; Npa = 0; Npa--) { //incompatible data types
                          Pc ++;
                          M = Pa * (Ia / (1- power(1+Ia,-1*Npa)));
                          Mi = Pa * Ia;
                          Mp = M - Mi;
                          Pa = Pa - Mp;
                          System.out.println("Current period " + Pc +
                                  " || Payment $" + M +
                                  " || Interest $" + Mi +
                                  " || Principal $" + Mp);
                  }
          }

          public float power (float Base, double Pow) {
            float Ans = Base;
            for(double x = 2; x > Pow; x++) {
                    Ans = Ans * Base;}
            return Ans;
    }
}

public class W2IA {
        public static void main(String[] args) {
            Loan myLoan = new Loan();
            myLoan.setP();
            myLoan.setI();
            myLoan.setN();

            System.out.println("For a loan with:");
            System.out.println("Principal amount of " + myLoan.P);
            System.out.println("Interest of " + myLoan.I);
            System.out.println("Number of periods (months) " + myLoan.Nprd);
                myLoan.CalcTbl();
    }
}

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Thanks for the help.

-RT

Well first thing I see is that you're using an assignment operator instead of a comparison operator. Your for loop should look like this

Code:

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for(int Npa = Nprd; Npa == 0; Npa--) {

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Actually, that is most likely the culprit. The program is trying to convert it from a boolean to an integer because you're using the comparison operator.

I also recomend using more relivent variable names to make it easier to follow the code.

Also, it would be good if you included comments in your code so that people read you code knows how it works.