function overloading

function overloading

         Use The same Function name as Function as Function name of the function of .

        for example ： Compare the size function of numbers ——— Function name   (  fun )

Compare the size of the number

doubt ： 1. The type of number （ int / float / double）

            2. Number of numbers （ 2 individual 3 individual ……）

These questions distinguish functions The key is ：

           1. The type of the argument to the function （ It needs to be considered Assignment compatibility The situation of ）

           2. The number of arguments to the function

Be careful ： Maybe someone will question , Why can't the return value of a function be the key to distinguishing functions ？

The compiler depends on the type and number of arguments in the call time statement , Determine the specific function version of the call , Compile phase , The program has not been executed , So I don't know what the return value is , More uncertain about the type .

Be careful ： When the parameter is reference

         The situation is special when the parameter is reference

        a key ： Compile time Sure distinguish

                                void fun(int a,int b)  and   void fun(double &a,double &b)

                    Compile time You can't distinguish

                                void fun(int a,int b)  and   void fun(int &a,int &b)

Be careful ： Is there a problem when the parameter is a pointer, like when the parameter is a reference ？

        answer ： no ！