java - Android Text input always give me NaN value -


i can not figure out why code output show nan. there can me figure out did mistake?

package com.example.user.solar_calculator;  import android.app.activity; import android.os.bundle; import android.view.menu; import android.view.menuitem; import android.content.context; import android.content.intent;  import android.widget.button; import android.view.view; import android.view.view.onclicklistener; import android.widget.edittext; import android.widget.toast;  public class efficiency extends activity {     button button;     edittext efficiency;     edittext vol;      string e,v;      double e1,wat,v1, ac_load_in_ampere_hour_calculation,dc;     double load,load_vol,total_daily_load,lol;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_efficiency);         initcontrols();         addlisteneronbutton();     }      public void initcontrols() {         efficiency=(edittext)findviewbyid(r.id.edittext1);         vol=(edittext)findviewbyid(r.id.edittext2);         button=(button)findviewbyid(r.id.button);         button.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 try {                     e1=double.parsedouble(efficiency.gettext().tostring()); // make use of autoboxing.  it's easier read.                 } catch (numberformatexception e) {                     e1=1;                 }                 try {                     v1=double.parsedouble(vol.gettext().tostring());// make use of autoboxing.  it's easier read.                 } catch (numberformatexception e) {                     v1=1;                 }                  bundle extras = getintent().getextras();                 if(extras !=null) {                     string value = extras.getstring("four");                     load=double.parsedouble(value.tostring());                 }                 wat=load_vol*(1+.1);                  ac_load_in_ampere_hour_calculation = (load)/( v1* (e1/100));                  total_daily_load=ac_load_in_ampere_hour_calculation+dc;                  intent = new intent(efficiency.this, calculation.class);                 //create bundle                 bundle bundle = new bundle();                 //add data bundle                  bundle.putstring("seven", string.valueof(ac_load_in_ampere_hour_calculation));                 bundle.putstring("eight", string.valueof(total_daily_load));                 bundle.putstring("nine", string.valueof(dc));                  //add bundle intent                 i.putextras(bundle);                 //fire second activity                 startactivity(i);             }         });     }      public void addlisteneronbutton() {             final context context = this;             button = (button) findviewbyid(r.id.button);         }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();          //noinspection simplifiableifstatement         if (id == r.id.action_settings) {             return true;         }          return super.onoptionsitemselected(item);     } }

i think line cause problem ac_load_in_ampere_hour_calculation = (load)/( v1* (e1/100));

because if v1 = 0 impossible.


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