Rock Paper Scissors written in Go

rock-paper-scissors.go

package main

import "fmt"
import "math/rand"
import "os"
import "os/exec"
import "time"

func main() {
    clearScreen()

    fmt.Println(" ┌─── Rock Paper Scissors ───┐ ")
    fmt.Println(" │            v1.0           │ ")
    fmt.Println(" └───────────────────────────┘ ")
    fmt.Println("    ROCK   PAPER   SCISSORS    ")
    fmt.Println("     1       2         3       ")
    fmt.Println()

    rand.Seed(time.Now().UnixNano())
    p2 := randBetween(1, 4)

    var p1 int
    for p1 < 1 || p1 > 3 {
        fmt.Print("Choose a number [1-3]: ")
        fmt.Scan(&p1)
        if (p1 < 1 || p1 > 3) {
            fmt.Println("You must choose a number between 1 and 3. Retry.")
            fmt.Println()
        }
    }

    fmt.Println()
    fmt.Println("You chose", printMove(p1))
    fmt.Println()
    fmt.Println("The CPU chose", printMove(p2))

    if p1 == p2 {
        fmt.Println()
        fmt.Println(printMove(p1), "==", printMove(p2))
        fmt.Println("It's a draw.")
    } else if (p1 == 1 && p2 == 3) || (p1 == 2 && p2 == 1) || (p1 == 3 && p2 == 2) {
        fmt.Println()
        fmt.Println(printMove(p1), "=>", printMove(p2))
        fmt.Println("YOU WON!")
    } else {
        fmt.Println()
        fmt.Println(printMove(p1), "<=", printMove(p2))
        fmt.Println("You lost. :(")
    }
}

func randBetween(min, max int) int {
    return min + rand.Intn(max - min)
}

func printMove(move int) string {
    switch (move) {
    case 1:
        return "ROCK"
    case 2:
        return "PAPER"
    case 3:
        return "SCISSORS"
    default:
        return "ERROR"
    }
}

func clearScreen() {
    c := exec.Command("clear")
    c.Stdout = os.Stdout
    c.Run()
}