如何在GoLang中比较字符串？

Question

I am unable to produce a 'true' result when it comes to Go string comparison. I wrote the following to explain the issue and attached a screenshot of the output

// string comparison in Go
package main
import "fmt"
import "bufio"
import "os"

func main() {
    var isLetterA bool 

    fmt.Println("Enter the letter a")
    reader := bufio.NewReader(os.Stdin)
    input, _ := reader.ReadString('
')

    if(input == "a") {
        isLetterA = true
    } else {
        isLetterA = false 
    }

    fmt.Println("You entered",input)
    fmt.Println("Is it the letter a?",isLetterA)

}

Answer 1

== is the correct operator to compare strings in Go. However, the strings that you read from STDIN with reader.ReadString do not contain "a", but "a " (if you look closely, you'll see the extra line break in your example output).

You can use the strings.TrimRight function to remove trailing whitespaces from your input:

if strings.TrimRight(input, "
") == "a" {
    // ...
}