Go Language learning 2: First GO Program

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I've always wondered why learning every language, starting with the first program is always Hello world, don't I write anything else, this language is not good to learn?

O (∩_∩) o haha ~, we do not delve into the here, or inherit the glorious tradition! The following is a completed Hello World program:

The package main ... ... ... ..... ... .... ... .... ... .... ..... .... ..... ..... ..... ..... ..... ..... .......-....... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ....... 1

Import(... ...) ... ... .... ... .... ... .... ... .... ... .... ..... ..... ..... ..... .... ..... ..... .....-.....-........ ... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ... 2

 "FMT" ... ... ... ... ... ... ... ... ... ... .... ... .... ..... .... ..... ....., ..., ... and .... ..... ....? ....., ... and .... ....... ... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ... .. ..... ..... 3

)........................................................................................................................................................................ 4

FuncMain (){... ..... ... .... ... ..... ..... ..... ..... ..... ..... ....... .................. ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ....... 5

 FMT. Println ("Helloworld!") .............................................................................. 6

}........................................................................................................................................................................ 7

Compile, the output after running is:

Hello world!

Let's analyze one of these codes (the numbers below represent the line numbers of the code):

1 should be like Java, put this file into a package, the registration is called Main

2 is the library file that imports the system

3 Use the Func key to define the function, and the Go Language program entry is the main function

4 calling the library function output string Hello World, note here: The go language rules, all exported functions or variables, the first letter must be capitalized.

It is also important to note that the Go Language program statement does not require a semicolon as a terminator.

Let's change this function:

The output of the program is:
Here are a few points of knowledge:
1. When there are multiple libraries that need to be imported, you can either have one () or import them separately:
2. The parameters of the function and the type of the return value are all back-mounted