i need how to write the c

Add the Following Code to OnClick

findViewly Id$($R$.$ id$.$ button$).$ setonClicklistener$($new

android.view.View.OnClickListener$()\{$

eoverride public void onclick$($android$.$view.View view$)\{$

android.widget. EditText Firsthidget $=$

findViewById $($R $.$ id $.$edit TextFirs tWame$)$;

android.widget. EditText Lasthlidget $=$ findViewById$($R$.$id$.$editTextlastMame$)$;

android. widget. EditText Fullwidget $=$ findViewById$($R$.$ id$.$ editTextFuLLMame$)$;

String Fullwame $=$ Firstwidget. getText $()*tostring()+$

Lastwidget $.$ get Text$().$ tostring$()$;

Ful Widget, setText$($Fullwane$)$;

$\}$

$\}\})$;