第七講（運算符和類型強制轉換）

 b=++ i=(i   o= s1=o1  ;
    ((.可空類型運算符 ?.空合並運算符 (???a==a??== b===
       =  Vector(, , =  Vector(, -, -= vect1 + + + +  Vector( x,  y, .x =.y =.z ====    + x +  + y +  + z +   Vector  += +=+=+=+   Currency( dollars, .Dollars =.Cents =   .Format(     value.Dollars + (value.Cents / 

                      Currency( dollars = ( cents = ()((value - dollars) *    Main(=  Currency(, + + balance2= balance;
 += + +
                                    = (Currency) (- + +   Currency( dollars, .Dollars =.Cents =   .Format(     value.Dollars + (value.Cents /     Currency( dollars = ( cents = ()((value - dollars) *    Main(=  Currency(, + + balance2= += + +
                                = (Currency) (-);
                 Console.WriteLine( + +