How to print out the value in a function from a user input in Go [closed]

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package main

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

func Option1() {
     fmt.Println("Option1")
}
func main() {
     for true {
         fmt.Println("Pleae enter text: ")
         reader := bufio.NewReader(os.Stdin)
         text, _ := reader.ReadString('\n')
         if text == "1" {
                Option1()
         }

      }
 }

So my code will eventually have multi functions example: option1 option2 and etc.. I'm trying to execute a function every time a user types 1, 2, 3 and etc, but my code doesn't print out whatever is in Option1.

Your help will be appreciated.

From the docs: "ReadString reads until the first occurrence of delim in the input, returning a string containing the data up to and including the delimiter." (emphasis mine). — Adrian
– Adrian, Commented May 4, 2020 at 20:29
The delimiter \n is included in the value returned by ReadString. In addition, the program discards data buffered from stdin. Use a Scanner instead. See this question for more info. — user5728991
– user5728991, Commented May 4, 2020 at 20:29
@larsks That will not work as you expect on all operating systems. Use a Scanner. — user5728991
– user5728991, Commented May 4, 2020 at 20:35
for { fmt.Println(prompt); if !scanner.Scan() { break }; text := scanner.Text(); /* do something with text */} — user5728991
– user5728991, Commented May 4, 2020 at 21:17

Arun · Accepted Answer · 2020-05-04 23:51:50Z

Ground rule is ReadString reads until the first occurrence of delim in the input, returning a string containing the data up to and including the delimiter. So I used text = strings.TrimSpace(text) to trim it before comparing .See the modified program.

package main

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

func Option1() {
    fmt.Println("Option1")
}
func main() {

    for true {
        fmt.Println("Pleae enter text: ")
        reader := bufio.NewReader(os.Stdin)
        text, _ := reader.ReadString('\n')
        fmt.Println("Length of text,before trimming:", len(text))
        text = strings.TrimSpace(text)
        fmt.Println("Length of text,after trimming:", len(text))
        if text == "1" {
            Option1()
        }

    }
}

Oputput is

VScode> go run sofstringcompare.go
Pleae enter text: 
1
Length of text,before trimming: 3
Length of text,after trimming: 1
Option1

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