Reputation: 361
package main
import (
"fmt"
"bufio"
"os"
)
func main() {
fmt.Print("LOADED!\n")
fmt.Print("insert y value here: ")
inputY := bufio.NewScanner(os.Stdin)
inputY.Scan()
inputXfunc()
}
func inputXfunc() {
fmt.Print("insert x value here: ")
inputX := bufio.NewScanner(os.Stdin)
inputX.Scan()
slope()
}
func slope() {
fmt.Println(inputX.Text())
}
Whenever I run this program, it says, that inputX and inputY are unidentified. How do I make this program use variables that are accessible to all of the functions? All I want to do is devide inputY by inputX then print out the result
Upvotes: 7
Views: 29650
Reputation: 8390
You can create an init()
function and make use of it in the main.go
by using package like godotenv
to set os's environment variables:
global.go
file
package global
import (
"log"
"os"
"strconv"
"github.com/joho/godotenv"
)
var (
SERVER_HOST string
SERVER_PORT int
)
func InitConfig() {
err := godotenv.Load()
if err != nil {
log.Fatal("Error loading .env file")
}
SERVER_HOST = os.Getenv("SERVER_HOST")
SERVER_PORT, _ = strconv.Atoi(os.Getenv("SERVER_PORT"))
}
main.go
file
package main
import(
G "path/to/config"
)
func init() {
G.InitConfig()
}
func main() {
G.Init()
}
You will still have to import "G" package in other packages to use the variables, but I think the best way to tackle global variables in Go (or any other languages) is to make use of environment variables.
Upvotes: 3
Reputation: 48154
I'm just putting my comment as an answer... I would recommend against this however you could just declare the variable at package scope. It would look like this;
package main
import (
"fmt"
"bufio"
"os"
)
var inputX io.Scanner
func main() {
fmt.Print("LOADED!\n")
fmt.Print("insert y value here: ")
inputY := bufio.NewScanner(os.Stdin)
inputY.Scan()
inputXfunc()
}
func inputXfunc() {
fmt.Print("insert x value here: ")
inputX = bufio.NewScanner(os.Stdin) // get rid of assignment initilize short hand here
inputX.Scan()
slope()
}
func slope() {
fmt.Println(inputX.Text())
}
However a better choice would be to change your method definitions to accept arguments and pass the values into them as needed. This would like like so;
func slope(inputX bufio.Scanner) {
fmt.Println(inputX.Text())
}
slope(myInputWhichIsOfTypeIOScanner)
Upvotes: 8