java - Creating dot-function for android calculator -

im doing small project, gathering random calculator codes net , improving them learn java , android development...

so, im trying implement dot-function calculator code, doesn't work it's supposed to. instead of adding dot, adds value 46 (why 46??). me create functional dot-function?

java code:

package com.example.elof_calculator;      import android.os.bundle;   import android.app.activity;   import android.view.menu;   import android.view.view;   import android.widget.button;   import android.widget.edittext;    public class mainactivity extends activity {     public string str ="";    character op = 'q';    double i,num,numtemp;       edittext showresult;       @override       public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      showresult = (edittext)findviewbyid(r.id.result_id);      }   public void btn1clicked(view v){    insert(1);    }     public void btn2clicked(view v){    insert(2);    }   public void btn3clicked(view v){    insert(3);    }   public void btn4clicked(view v){    insert(4);    }   public void btn5clicked(view v){    insert(5);    }   public void btn6clicked(view v){    insert(6);   }   public void btn7clicked(view v){    insert(7);    }   public void btn8clicked(view v){    insert(8);    }   public void btn9clicked(view v){    insert(9);    }   public void btn0clicked(view v){       insert(0);       }   public void btndotclicked(view v){       insert('.');       //error       }   public void btnplusclicked(view v){    perform();    op = '+';    }     public void btnminusclicked(view v){       perform();      op = '-';    }   public void btndivideclicked(view v){    perform();    op = '/';    }   public void btnmulticlicked(view v){    perform();    op = '*';    }   public void btnequalclicked(view v){    calculate();    }     public void btnclearclicked(view v){    reset();   }   private void reset() {     // todo auto-generated method stub   str ="";   op ='q';   num = 0;   numtemp = 0;   showresult.settext("");   }  private void insert(int j) {     // todo auto-generated method stub    str = str+integer.tostring(j);    num = integer.valueof(str).intvalue();    showresult.settext(str);     }      private void perform() {     // todo auto-generated method stub     str = "";     numtemp = num;      }       private void calculate() {      // todo auto-generated method stub      if(op == '+')     num = numtemp+num;    else if(op == '-')     num = numtemp-num;    else if(op == '/')     num = numtemp/num;    else if(op == '*')     num = numtemp*num;    showresult.settext(""+num);      }      } 

xml code dot-button:

 <button             android:id="@+id/btndot_id"             style="?android:attr/buttonstylesmall"             android:layout_width="70dp"             android:layout_height="64dp"             android:background="@drawable/buttonstyle1"             android:gravity="center_vertical|center_horizontal"             android:text="."             android:textcolor="@android:color/white"             android:textsize="22sp"               android:onclick="btndotclicked"             /> 

here java function , code dot-function specifically, main error:

 public void btndotclicked(view v){       insert('.');        } 

so, how should code dot-function be? appreciated :))

the problem insert function has signature void insert(int j)

in java implicit widening conversion take place, if use char primitive type when int type expected. example valid java:

int dot = '.'; 

however, value of int variable dot 46 happens integer corresponds bit pattern used represent '.'.

what can do, change insert function accept string parameters , add overload int parameters. need change logic around num since can have floating point numbers.

private void insert(int value) {     insert(integer.tostring(value));     ...     num = double.parsedouble(str); }  private void insert(string value) {             ... }  ...  public void btndotclicked(view v){     insert("."); // inserting string instead of char }