How to read and parse a floating-point number from a bufio.Reader in Go?

To read and parse a floating-point number from a bufio.Reader in Go, you can use the following steps:

Import the required packages:

import (
    "bufio"
    "fmt"
    "os"
    "strconv"
    "strings"
)

Create a bufio.Reader to read input from the desired source (e.g., os.Stdin for reading from the command-line input):

reader := bufio.NewReader(os.Stdin)

Read a line of input from the reader using the ReadString method:

input, _ := reader.ReadString('\n')

Use the strings.TrimSpace method to remove leading and trailing whitespace from the input string:

input = strings.TrimSpace(input)

Convert the input string to a float64 using the strconv.ParseFloat function:

number, err := strconv.ParseFloat(input, 64)
if err != nil {
    fmt.Println("Invalid input:", err)
    return
}

Here, 64 specifies the precision of the floating-point number. You can choose a different value based on your requirements.

Use the parsed floating-point number as needed in your program:

fmt.Println("Parsed number:", number)
// You can perform further calculations or operations using the parsed number

Overall, the complete code will look like this:

package main

import (
    "bufio"
    "fmt"
    "os"
    "strconv"
    "strings"
)

func main() {
    reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter a floating-point number: ")
    input, _ := reader.ReadString('\n')
    input = strings.TrimSpace(input)

    number, err := strconv.ParseFloat(input, 64)
    if err != nil {
        fmt.Println("Invalid input:", err)
        return
    }

    fmt.Println("Parsed number:", number)
    // You can perform further calculations or operations using the parsed number
}

When you run the program, it will prompt you to enter a floating-point number. Once you enter the number, it will parse and display the result.