Why Doesn't `reader.ReadString('\n')` Reliably Handle Newline Delimiters in Go?

Why reader.ReadString Doesn't Properly Handle Delimeters

In the provided Go program, the issue arises when using reader.ReadString('n') to read a line of text. When the user enters "Alice" or "Bob," the input text contains an additional newline character, causing a mismatch with the specified delimiter ('n').

Solution: Trim or Use ReadLine

To resolve this issue, you can either trim the whitespace (including the newline character) after reading the string or use reader.ReadLine() directly.

Trimming Whitespace with strings.TrimSpace

package main

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

func main() {
    reader := bufio.NewReader(os.Stdin)
    fmt.Print("Who are you? \n Enter your name: ")
    text, _ := reader.ReadString('\n')
    if aliceOrBob(strings.TrimSpace(text)) {
        fmt.Printf("Hello, ", text)
    } else {
        fmt.Printf("You're not allowed in here! Get OUT!!")
    }
}

Using ReadLine

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    reader := bufio.NewReader(os.Stdin)
    fmt.Print("Who are you? \n Enter your name: ")
    text, _, _ := reader.ReadLine()
    if aliceOrBob(string(text)) {
        fmt.Printf("Hello, ", text)
    } else {
        fmt.Printf("You're not allowed in here! Get OUT!!")
    }
}

By properly handling the input string, the program can now correctly identify whether the user's name is "Alice" or "Bob" and respond accordingly.

The above is the detailed content of Why Doesn't `reader.ReadString('\n')` Reliably Handle Newline Delimiters in Go?. For more information, please follow other related articles on the PHP Chinese website!