RegisterGreeterHandler registers the http handlers for service Greeter to "mux". The handlers forward requests to the grpc endpoint over "conn".

RegisterGreeterHandlerClient registers the http handlers for service Greeter to "mux". The handlers forward requests to the grpc endpoint over the giv

Sends a greeting

SayHello implements helloworld.GreeterServer

* */

ToMap converts a struct to a map using the struct's tags. ToMap uses tags on struct fields to decide which fields to add to the returned map.

pem , base64 ASCII, 用于x509 certificates pem, 常用后缀.crt, .pem, .cer, and .Key

--------------- default Error ---------------

Declaring Rect struct method

* Bubble sort， 也叫sinking sort下沉算法 性能： Worst case performance O(n^2)，n * n, n个for循环 Best case performance O(n) ， n, 一个for循环 Average case performance

优化版本一， j循环减少i次循环

优化版本二， j循环减少i次循环， i 也减少n次循环

calcDistance calculates the distance between two points using the "haversine" formula. The formula is based on http://mathforum.org/library/drmath/vie

callSayHello calls SayHello on c with the given name, and prints the response.