======Chpt 15 exercises routine======
//Iteration records of the specified class in Chpt 15 exercises.//
----
====Quote class====
    * //15.3//: ''Quote'' Implementation
    * //15.5//: ''Bulk_quote'' Implementation
    * //15.7//: ''Limited_quote'' Implementation 
    * //15.11//: virual function ''debug'' Implementation 
    * //15.15//: ''Disc_quote'' Implementation, adapting ''Bulk_quote'' to it
    * //15.16//: adapting ''Limited_quote'' to ''Disc_quote''
    * //15.26//: adding copy control members to ''Quote'' & ''Bulk_quote''
    * //15.27//: testing how inherited constructor works in ''Bulk_quote''