Added go version of Depth_Charge

00_Alternate_Languages/31_Depth_Charge/go/main.go

@@ -0,0 +1,156 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"math/rand"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Position []int
+
+func NewPosition() Position {
+	p := make([]int, 3)
+	return Position(p)
+}
+
+func showWelcome() {
+	fmt.Print("\033[H\033[2J")
+	fmt.Println("                DEPTH CHARGE")
+	fmt.Println("    Creative Computing  Morristown, New Jersey")
+	fmt.Println()
+}
+
+func getNumCharges() (int, int) {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for {
+		fmt.Println("Dimensions of search area?")
+		scanner.Scan()
+		dim, err := strconv.Atoi(scanner.Text())
+		if err != nil {
+			fmt.Println("Must enter an integer number. Please try again...")
+			continue
+		}
+		return dim, int(math.Log2(float64(dim))) + 1
+	}
+}
+
+func askForNewGame() {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	fmt.Println("Another game (Y or N): ")
+	scanner.Scan()
+	if strings.ToUpper(scanner.Text()) == "Y" {
+		main()
+	}
+	fmt.Println("OK. Hope you enjoyed yourself")
+	os.Exit(1)
+}
+
+func showShotResult(shot, location Position) {
+	result := "Sonar reports shot was "
+
+	if shot[1] > location[1] { // y-direction
+		result += "north"
+	} else if shot[1] < location[1] { // y-direction
+		result += "south"
+	}
+
+	if shot[0] > location[0] { // x-direction
+		result += "east"
+	} else if shot[0] < location[0] { // x-direction
+		result += "west"
+	}
+
+	if shot[1] != location[1] || shot[0] != location[0] {
+		result += " and "
+	}
+	if shot[2] > location[2] {
+		result += "too low."
+	} else if shot[2] < location[2] {
+		result += "too high."
+	} else {
+		result += "depth OK."
+	}
+
+	fmt.Println(result)
+}
+
+func getShot() Position {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for {
+		shotPos := NewPosition()
+		fmt.Println("Enter coordinates: ")
+		scanner.Scan()
+		rawGuess := strings.Split(scanner.Text(), " ")
+		if len(rawGuess) != 3 {
+			goto there
+		}
+		for i := 0; i < 3; i++ {
+			val, err := strconv.Atoi(rawGuess[i])
+			if err != nil {
+				goto there
+			}
+			shotPos[i] = val
+		}
+		return shotPos
+	there:
+		fmt.Println("Please enter coordinates separated by spaces")
+		fmt.Println("Example: 3 2 1")
+	}
+}
+
+func getRandomPosition(searchArea int) Position {
+	pos := NewPosition()
+	for i := 0; i < 3; i++ {
+		pos[i] = rand.Intn(searchArea)
+	}
+	return pos
+}
+
+func playGame(searchArea, numCharges int) {
+	rand.Seed(time.Now().UTC().UnixNano())
+	fmt.Println("\nYou are the captain of the destroyer USS Computer.")
+	fmt.Println("An enemy sub has been causing you trouble. Your")
+	fmt.Printf("mission is to destroy it. You have %d shots.\n", numCharges)
+	fmt.Println("Specify depth charge explosion point with a")
+	fmt.Println("trio of numbers -- the first two are the")
+	fmt.Println("surface coordinates; the third is the depth.")
+	fmt.Println("\nGood luck!")
+	fmt.Println()
+
+	subPos := getRandomPosition(searchArea)
+
+	for c := 0; c < numCharges; c++ {
+		fmt.Printf("\nTrial #%d\n", c+1)
+
+		shot := getShot()
+
+		if shot[0] == subPos[0] && shot[1] == subPos[1] && shot[2] == subPos[2] {
+			fmt.Printf("\nB O O M ! ! You found it in %d tries!\n", c+1)
+			askForNewGame()
+		} else {
+			showShotResult(shot, subPos)
+		}
+	}
+
+	// out of depth charges
+	fmt.Println("\nYou have been torpedoed! Abandon ship!")
+	fmt.Printf("The submarine was at %d %d %d\n", subPos[0], subPos[1], subPos[2])
+	askForNewGame()
+
+}
+
+func main() {
+	showWelcome()
+
+	searchArea, numCharges := getNumCharges()
+
+	playGame(searchArea, numCharges)
+}