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This article will explain in detail how to use the main function with parameters in the Go language. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Method 1: os.Args implementation

Let's write a main function, where os.Args is a [] string type. When you run the main function, the parameters on the command line are written to the os.Args data.

However, such parameters cannot specify what type or what tag is, for example:-t,-h, and so on.

1. Put os.Args directly into the main function

Output1:

$. / args1

Output2:

$. / args1-y-t-o 0000000

Note: the output result can be found in os.Args, and the executed command. / args1 will also be placed in os.Args [0].

two。 For the os.Args implementation in argsfunc ()

Os.Args can be used not only in the main function, but also in other functions, so os.Args is more like a global variable. It should have written the parameters on the command line to os.Args before main.

Output:

$. / args 0 000 1 20 30

Note: as you can see from the output, the parameters implemented in the main function are no different from the os.Args implemented in the argsfunc function.

Method 2: flag package implementation

The flag package has more powerful support for parameters, specifying not only the tag of the parameters (for example:-h,-t, etc.), but also the type of each parameter.

When using flag, first, declare the type and format of the parameter; second, you need to call flag.Parse () before using the parameter, which should parse the parameter list on the command line into the parameter format of your life.

Output 1: / / just execute the executable file

$. / args2

$. / args2-b-s hello-t 10 the other args

Note: from the output result, we can see that after flag.Parse () parsing, the. / args is not taken as the first parameter, just like the data read from os.Args [1:], but not the data of os.Args [0].

So much for sharing about how to use the main function with parameters in the GE language. I hope the above content can be of some help and learn more knowledge. If you think the article is good, you can share it for more people to see.

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