private void igualActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_igualActionPerformed
        y=Double.parseDouble(cuadro.getText());
        numero="";
        if(signo=='+') {
            resp=x+y;
            cuadro.setText(resp+"");
        }

        if(signo=='-') {
            resp=x-y;
            cuadro.setText(resp+"");
        }
        if(signo=='*') {
            resp=x*y;
            cuadro.setText(resp+"");
        }
        if(signo=='/') {
            if(y!=0) {
                resp=x/y;
                cuadro.setText(resp+"");
            } else
                cuadro.setText("Error: division por cero");
        }

        if(signo=='p') {
            resp=Math.pow(x,y);
            cuadro.setText(resp+"");
        }

        if(signo=='%') {
            resp=y/100;
            cuadro.setText(x*resp+"");
        }
}//GEN-LAST:event_igualActionPerformed