Golang中的简单整数声明

Question

I didn't consider myself to be a newbie, but I can't figure out why this very simple code snippet fails to declare my integer.

func main () {

    var totalResults int

    rFile, err := os.Open("users.csv") //3 columns
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer rFile.Close()

    // Creating csv reader
    reader := csv.NewReader(rFile)

    lines, err := reader.ReadAll()
    if err == io.EOF {
        fmt.Println("Error:", err)
        return
    } else {

    }

    totalResults=len(lines)

}

It always says the value is not declared, this seems too simple.

I'm pretty sure it would work if I declared it using :=, but I wanted to declare everything at the top of the function.

Answer 1

change your code:

lines, err := reader.ReadAll()
if err == io.EOF {
    fmt.Println("Error:", err)
    return
} else {

}

    totalResults=len(lines)

}

to:

    lines, err := reader.ReadAll()
if err == io.EOF {
    totalResults=len(lines)
} else {
    fmt.Println("Error:", err)
    return
}
    fmt.Println("total results:", totalResults)
}