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Assume the existence of a class named window with functions named close and freeresources, both of which accept no parameters and return no value . write a destructor for the class that invokes close followed by freeresources.

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BlueSky06
In your question whereas there is a class named window and it would be like this:

class window {
//code here 
}

Next is there is a function called close and freeresource and it goes like this:

class window{
  function close( ){
   //code here
  }
  function freeresource( ){
  // code here
  }
 public destruct (){
this.close();
this.freeresource();
}

}
The last code function destruct invokes the function close and freeresource. Hope this would help 

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