what is the difference ?

[serene patrol]

package main

import ("fmt";"os")

func main() {
    file, _ := os.Open("test.txt")

    var one string
    var two string

    fmt.Fscan(file, &one, &two)

    fmt.Println(one, two)

}

fmt.fscan and fmt.fscanln produces the same output :

name unknown

where is the difference between these two functions ????

[balmy marlin]

https://pkg.go.dev/fmt#Fscanln

[gray dirge]

fmt: Fscanln

    func Fscanln(r io.Reader, a ...any) (n int, err error)

Fscanln is similar to Fscan, but stops scanning at a newline and after the final item there must be a newline or EOF.

[serene patrol]

؟

[balmy marlin]

Fscanln is similar to Fscan, but stops scanning at a newline and after the final item there must be a newline or EOF.

[serene patrol]

it doesn't

name unknown

is all what is in the file

[balmy marlin]

how the file looks like?

[serene patrol]

fmt.fscanln should stop at the newline

let me show you

[queen hemlock]

What doesn't what

[serene patrol]

she / he said fmt.fscanln stops reading at the newline character

[queen hemlock]

Or the end of file yes

[serene patrol]

i replied to her/him by it doesn't

[balmy marlin]

https://go.dev/play/p/ogArCz9dMNI

newLineFscanln stops on new line

[balmy marlin]

can you show the whole IDE screen?

[serene patrol]

sure

i tried using cmd

is there anything wrong with the compiler ???????

[balmy marlin]

thats strange

im gonna run windows VM, gimme 10-20 minutes to check it

[serene patrol]

ok my mate

[balmy marlin]

can you run go version in cmd?

[serene patrol]

sure

[balmy marlin]

[balmy marlin]

i would try to create a new folder, copy the content of the playground into a new main.go in that folder and then run

[serene patrol]

have you tried it with a file ?

package main 

import ("fmt";"os")

func main() {
    file,_ := os.Open("test.txt")
    
    var one string 
    var two string 
    
    fmt.Fscanln(file, &one, &two)
    
    fmt.Println(one, two)
}

[balmy marlin]

s := "name unknown"
file := strings.NewReader(s)

// test.txt:
// name unknown
file, _ := os.Open("test.txt")```

thats almost the same

in this context

[serene patrol]

not the same

with files the issue occures

[balmy marlin]

add new line to the file

and use fmt.Fscanln

[serene patrol]

package main 

import "fmt"
import "strings"

func main() {
    //file, _ := os.Open("test.txt")
    file := strings.NewReader("hello world")


    var one string 
    var two string 

    fmt.Fscan(file, &one, &two)

    fmt.Println(one, two)
}

same thing

[serene patrol]

yes i did the same

and i get the same issue

[balmy marlin]

package main

import (
    "fmt"
    "os"
)

func spaceFscan() {
    r, _ := os.Open("space.txt")

    var one string
    var two string

    fmt.Fscan(r, &one, &two)

    fmt.Println(one, two)
}

func newLineFscan() {
    r, _ := os.Open("new_line.txt")

    var one string
    var two string

    fmt.Fscan(r, &one, &two)

    fmt.Println(one, two)
}

func newLineFscanln() {
    r, _ := os.Open("new_line.txt")

    var one string
    var two string

    fmt.Fscanln(r, &one, &two)

    fmt.Println(one, two)
}

func spaceFscanln() {
    r, _ := os.Open("space.txt")

    var one string
    var two string

    fmt.Fscanln(r, &one, &two)

    fmt.Println(one, two)
}

func main() {
    spaceFscan()
    spaceFscanln()

    newLineFscan()
    newLineFscanln()
}

space.txt:

name unknown```

new_line.txt:
```txt
name
unknown```

the same result as with https://go.dev/play/p/ogArCz9dMNI

[serene patrol]

???????????????

i swear to god i get the same output i used 4 editors