How to Read Space-Separated Strings from a String Using Fmt.Scanln?

Reading Space-Separated Strings from a String Using Fmt.Scanln

The Scanln function, part of the fmt package, enables the reading of input from a string. However, a common issue encountered when using Scanln is obtaining only the first word when expecting multiple space-separated words.

In the example provided:

<code class="go">package main

import "fmt"

func main() {
    var s string
    fmt.Scanln(&s)
    fmt.Println(s)
    return
}</code>

When running this code with the input "31 of month," it outputs "31" instead of the expected "31 of month." This is because Scanln treats the input as a single token, ignoring spaces.

To resolve this issue, you can utilize the following solutions:

1. Scan Multiple Variables Simultaneously

fmt Scanln accepts multiple arguments, allowing you to read multiple words simultaneously.

<code class="go">package main

import "fmt"

func main() {
    var s1 string
    var s2 string
    fmt.Scanln(&s1, &s2)
    fmt.Println(s1)
    fmt.Println(s2)
    return
}</code>

This code will correctly output "31" and "of month."

2. Use Bufio Scanner

The bufio package simplifies the process of reading input from a variety of sources, including strings.

<code class="go">package main
import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    for scanner.Scan() {
        s := scanner.Text()
        fmt.Println(s)
    }
    if err := scanner.Err(); err != nil {
        os.Exit(1)
    }
}</code>

With this code, you can read and print each line individually.

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