From the fmt package; the Scanf function is used to read input from stdin. When you run this snippet of code the main() function will wait for user input a string, a number, and a second string. Which it puts into variables, and then uses to print some information.

Scanf woul be used when you want to write a command line program that requires user input during the running process.

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var s1   string
var s2   string
var rint int

_, err := fmt.Scanf("%s %d %s", &s1, &rint, &s2)
if err != nil {
    panic(err)
}

fmt.Println("this is the first string from the commandline: ", s1)
fmt.Println("this is the first int from the commandline: ", rint)
fmt.Println("this is the second string from the commandline: ", s2)