How to Read Space-Separated Strings with fmt.Scanln in Go?

Using fmt.Scanln to Read Space-Separated Strings

While using fmt.Scanln(), it is common to encounter instances where desired text is truncated. Consider the following example:

<code class="go">package main

import "fmt"

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

With the input "30 of month," the expected output would be "30 of month," but instead, the result is truncated to "30." This is because Scanln expects a newline character to terminate input.

Solution:

To read space-separated tokens, use the fmt Scan family:

<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 approach explicitly specifies multiple variables for input, ensuring that each token is correctly read.

Alternative Solution: bufio.Scan

Alternatively, consider using the bufio scanner:

<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>

This method reads input line by line, providing greater flexibility and control over the input process.

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