public void actionPerformed (ActionEvent jalan) { try{ if(jalan.getSource() == btnProses) { Double Angka = Double.parseDouble(txtAngka.getText()); Double Pangkat = Double.parseDouble(txtPangkat.getText()); double k=1; double n=1; while (n<=Pangkat){ n++; k=k*Angka; } BigDecimal Hasil3 = new ...