Operator overload keyword operator

The operator keyword is used to overload built-in operators using the following methods:

 Public classoperatorcontroller:controller{//        //GET:/operator/         Public intnum, den;  PublicOperatorcontroller (intNumintden) {             This. num =num;  This. den =den; }        //overload operator +         Public StaticOperatorcontrolleroperator+(Operatorcontroller A, Operatorcontroller b) {return NewOperatorcontroller (A.num * b.den + b.num *A.den, A.den*B.den); }        //overload operator *         Public StaticOperatorcontrolleroperator*(Operatorcontroller A, Operatorcontroller b) {return NewOperatorcontroller (A.num * b.num, A.den *B.den); }}

The Operatorcontroller class above provides an overloaded method for constructors and "+", "*".

Here is a set of execution codes:

var New Operatorcontroller (12); var New Operatorcontroller (37); var New Operatorcontroller (23); var d = a + b; var e = A * b + C;

For the sake of understanding, I will execute the variable one by one output in the process:

A

Response.Write ("A:""--""<br/> ");

Output:a:1--2

B

Response.Write ("B:""--""< br/>");

Output: b:3--7

C

Response.Write ("C:""--""<br/> ");

Output: b:2--3

D

Response.Write ("D:""--""<br />");

Output: d:13--14

E

Response.Write ("e:""--""<br/> ");

Output: e:37--42

Next, focus on how the overloaded "+" is implemented:

Take var d = a + B; For example, break down the execution process,

Step1. Perform a "+" overloaded method

 Public Static operator +(Operatorcontroller A, Operatorcontroller b) {      returnnew Operatorcontroller (A.num * b.den + b.num ** b.den);}

When A and B are "+" operations, A and B are passed as parameters to this overloaded method (the overloaded operator only supports two parameters ), the operation can be transformed into

 Public Static operator +(Operatorcontroller A, Operatorcontroller b) {      returnnew Operatorcontroller (+);}

Step2. Execute constructor

 Public Operatorcontroller (intint  den) {This     . num = num;     this. den = den;}  

So Execute Response.Write ("D:" + D.num + "--" + D.den + "<br/>"), Output d:13--14

Operator overload keyword operator