Show output please help

and show output. (Refer to the following header file to do 4 Trace the client code on the ne so) xt page / @file PlainBox h #ifndefPLAINBox #define-PLAIN-BOX - - typedef double ItemType class PlainBox 2. Wha private: ItemType item public / Default constructor PlainBox ): onsic ould I/ Parameterized constructor PlainBox (const ItemType & theltem); fct ud ni ll Method to change the value of the data field void setitem (const ItemType & theltem); /l Method to return the value of the data field ItemType getltem () const PlainBox: PlainBox () item = 0 PlainBox:: PlainBox (const ItemType & theltem) item theltem void PlainBox:setltem (const ItemType & theltem) item theltem ItemType PlainBox: getltem () const return item; /remainder of implementation NOT shown endif Il GO To Next Page