Added go version of Even Wins

00_Alternate_Languages/35_Even_Wins/go/evenwins.go

@@ -0,0 +1,197 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const MAXTAKE = 4
+
+type PlayerType int8
+
+const (
+	HUMAN PlayerType = iota
+	COMPUTER
+)
+
+type Game struct {
+	table    int
+	human    int
+	computer int
+}
+
+func NewGame() Game {
+	g := Game{}
+	g.table = 27
+
+	return g
+}
+
+func printIntro() {
+	fmt.Println("Welcome to Even Wins!")
+	fmt.Println("Based on evenwins.bas from Creative Computing")
+	fmt.Println()
+	fmt.Println("Even Wins is a two-person game. You start with")
+	fmt.Println("27 marbles in the middle of the table.")
+	fmt.Println()
+	fmt.Println("Players alternate taking marbles from the middle.")
+	fmt.Println("A player can take 1 to 4 marbles on their turn, and")
+	fmt.Println("turns cannot be skipped. The game ends when there are")
+	fmt.Println("no marbles left, and the winner is the one with an even")
+	fmt.Println("number of marbles.")
+	fmt.Println()
+}
+
+func (g *Game) printBoard() {
+	fmt.Println()
+	fmt.Printf(" marbles in the middle: %d\n", g.table)
+	fmt.Printf("    # marbles you have: %d\n", g.human)
+	fmt.Printf("# marbles computer has: %d\n", g.computer)
+	fmt.Println()
+}
+
+func (g *Game) gameOver() {
+	fmt.Println()
+	fmt.Println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+	fmt.Println("!! All the marbles are taken: Game Over!")
+	fmt.Println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
+	fmt.Println()
+	g.printBoard()
+	if g.human%2 == 0 {
+		fmt.Println("You are the winner! Congratulations!")
+	} else {
+		fmt.Println("The computer wins: all hail mighty silicon!")
+	}
+	fmt.Println()
+}
+
+func getPlural(count int) string {
+	m := "marble"
+	if count > 1 {
+		m += "s"
+	}
+	return m
+}
+
+func (g *Game) humanTurn() {
+	scanner := bufio.NewScanner(os.Stdin)
+	maxAvailable := MAXTAKE
+	if g.table < MAXTAKE {
+		maxAvailable = g.table
+	}
+
+	fmt.Println("It's your turn!")
+	for {
+		fmt.Printf("Marbles to take? (1 - %d) --> ", maxAvailable)
+		scanner.Scan()
+		n, err := strconv.Atoi(scanner.Text())
+		if err != nil {
+			fmt.Printf("\n  Please enter a whole number from 1 to %d\n", maxAvailable)
+			continue
+		}
+		if n < 1 {
+			fmt.Println("\n  You must take at least 1 marble!")
+			continue
+		}
+		if n > maxAvailable {
+			fmt.Printf("\n  You can take at most %d %s\n", maxAvailable, getPlural(maxAvailable))
+			continue
+		}
+		fmt.Printf("\nOkay, taking %d %s ...\n", n, getPlural(n))
+		g.table -= n
+		g.human += n
+		return
+	}
+}
+
+func (g *Game) computerTurn() {
+	marblesToTake := 0
+
+	fmt.Println("It's the computer's turn ...")
+	r := float64(g.table - 6*int((g.table)/6))
+
+	if int(g.human/2) == g.human/2 {
+		if r < 1.5 || r > 5.3 {
+			marblesToTake = 1
+		} else {
+			marblesToTake = int(r - 1)
+		}
+	} else if float64(g.table) < 4.2 {
+		marblesToTake = 4
+	} else if r > 3.4 {
+		if r < 4.7 || r > 3.5 {
+			marblesToTake = 4
+		}
+	} else {
+		marblesToTake = int(r + 1)
+	}
+
+	fmt.Printf("Computer takes %d %s ...\n", marblesToTake, getPlural(marblesToTake))
+	g.table -= marblesToTake
+	g.computer += marblesToTake
+}
+
+func (g *Game) play(playersTurn PlayerType) {
+	g.printBoard()
+
+	for {
+		if g.table == 0 {
+			g.gameOver()
+			return
+		} else if playersTurn == HUMAN {
+			g.humanTurn()
+			g.printBoard()
+			playersTurn = COMPUTER
+		} else {
+			g.computerTurn()
+			g.printBoard()
+			playersTurn = HUMAN
+		}
+	}
+}
+
+func getFirstPlayer() PlayerType {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for {
+		fmt.Println("Do you want to play first? (y/n) --> ")
+		scanner.Scan()
+
+		if strings.ToUpper(scanner.Text()) == "Y" {
+			return HUMAN
+		} else if strings.ToUpper(scanner.Text()) == "N" {
+			return COMPUTER
+		} else {
+			fmt.Println()
+			fmt.Println("Please enter 'y' if you want to play first,")
+			fmt.Println("or 'n' if you want to play second.")
+			fmt.Println()
+		}
+	}
+}
+
+func main() {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	printIntro()
+
+	for {
+		g := NewGame()
+
+		g.play(getFirstPlayer())
+
+		fmt.Println("\nWould you like to play again? (y/n) --> ")
+		scanner.Scan()
+		if strings.ToUpper(scanner.Text()) == "Y" {
+			fmt.Println("\nOk, let's play again ...")
+		} else {
+			fmt.Println("\nOk, thanks for playing ... goodbye!")
+			return
+		}
+
+	}
+
+}