10.Operator Overloading
	10.1.overload plus subtract( 4 )	10.12.overload comma operator( 2 )
	10.2.overload object and primitive data type( 3 )	10.13.overload new operator( 3 )
	10.3.overload assignment operator( 5 )	10.14.overload delete operator( 1 )
	10.4.overload logic operator( 1 )	10.15.overload ostream istream operator( 10 )
	10.5.overload conversion operator( 1 )	10.16.overload operator with friend( 2 )
	10.6.overload pointer operator( 2 )	10.17.overload with friend function( 1 )
	10.7.overload address of operator( 1 )	10.18.overloading Dereference operator( 1 )
	10.8.overload unary operator( 8 )	10.19.custom extractor( 1 )
	10.9.overload bracket operator( 6 )	10.20.custom inserter( 2 )
	10.10.overload square bracket( 2 )	10.21.enum operator( 1 )
	10.11.overload cast operator( 1 )