Why Does Scanf Skip Input on Windows? A Detailed Explanation and Solution.

Scanf Function Quirks on Windows

While utilizing Scanf for user input, a peculiar behavior has been observed: it successfully retrieves input the first time, but skips the second input request and abruptly exits the function. This issue is encountered specifically when running on Windows systems.

Code in Question:

<code class="go">func credentials() (string, string) {

    var username string
    var password string

    fmt.Print("Enter Username: ")
    fmt.Scanf("%s", &username)

    fmt.Print("Enter Password: ")
    fmt.Scanf("%s", &password)

    return username, password
}</code>

Solution:

Scanf's reliance on spaces as separators and its unintuitive behavior can be problematic. To mitigate this, using the bufio package provides a more refined approach:

<code class="go">func credentials() (string, string) {
    reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter Username: ")
    username, _ := reader.ReadString('\n')

    fmt.Print("Enter Password: ")
    password, _ := reader.ReadString('\n')

    return strings.TrimSpace(username), strings.TrimSpace(password) // Remove any trailing newline characters
}</code>

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