How to define and parse floating-point number command-line flags in Go?

To define and parse floating-point number command-line flags in Go, you can make use of the flag package provided by the standard library. Here's an example code that demonstrates how to define and parse floating-point number flags:

package main

import (
	"flag"
	"fmt"
)

func main() {
	// Define the floating-point number flag with a default value of 0.0
	floatFlag := flag.Float64("floatFlag", 0.0, "floating-point number flag")

	// Parse the command-line flags
	flag.Parse()

	// Access the parsed value of the floating-point number flag
	fmt.Println("floatFlag:", *floatFlag)
}

In the above code:

We import the flag package and fmt package.
We define a floatFlag variable using the flag.Float64 function. This function takes three arguments – the name of the flag, the default value, and a description of the flag.
We call flag.Parse() to parse the command-line flags and set the values of the defined flag variables.
We use *floatFlag to access the parsed value of the floating-point number flag and print it.

To run the program with a command-line argument, you can pass the flag using the -flagName syntax. For example:

$ go run main.go -floatFlag 3.14

This will output:

floatFlag: 3.14

If you don't provide a value for the flag, the default value (0.0 in this case) will be used.