Added go version of Gunner

00_Alternate_Languages/42_Gunner/go/main.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"math/rand"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func printIntro() {
+	fmt.Println("                                 GUNNER")
+	fmt.Println("               CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY")
+	fmt.Print("\n\n\n")
+	fmt.Println("YOU ARE THE OFFICER-IN-CHARGE, GIVING ORDERS TO A GUN")
+	fmt.Println("CREW, TELLING THEM THE DEGREES OF ELEVATION YOU ESTIMATE")
+	fmt.Println("WILL PLACE A PROJECTILE ON TARGET.  A HIT WITHIN 100 YARDS")
+	fmt.Println("OF THE TARGET WILL DESTROY IT.")
+	fmt.Println()
+}
+
+func getFloat() float64 {
+	scanner := bufio.NewScanner(os.Stdin)
+	for {
+		scanner.Scan()
+		fl, err := strconv.ParseFloat(scanner.Text(), 64)
+
+		if err != nil {
+			fmt.Println("Invalid input")
+			continue
+		}
+
+		return fl
+	}
+}
+
+func play() {
+	gunRange := int(40000*rand.Float64() + 20000)
+	fmt.Printf("\nMAXIMUM RANGE OF YOUR GUN IS %d YARDS\n", gunRange)
+
+	killedEnemies := 0
+	S1 := 0
+
+	for {
+		targetDistance := int(float64(gunRange) * (0.1 + 0.8*rand.Float64()))
+		shots := 0
+
+		fmt.Printf("\nDISTANCE TO THE TARGET IS %d YARDS\n", targetDistance)
+
+		for {
+			fmt.Print("\n\nELEVATION? ")
+			elevation := getFloat()
+
+			if elevation > 89 {
+				fmt.Println("MAXIMUM ELEVATION IS 89 DEGREES")
+				continue
+			}
+
+			if elevation < 1 {
+				fmt.Println("MINIMUM ELEVATION IS 1 DEGREE")
+				continue
+			}
+
+			shots += 1
+
+			if shots < 6 {
+				B2 := 2 * elevation / 57.3
+				shotImpact := int(float64(gunRange) * math.Sin(B2))
+				shotProximity := int(targetDistance - shotImpact)
+
+				if math.Abs(float64(shotProximity)) < 100 { // hit
+					fmt.Printf("*** TARGET DESTROYED *** %d ROUNDS OF AMMUNITION EXPENDED.\n", shots)
+					S1 += shots
+
+					if killedEnemies == 4 {
+						fmt.Printf("\n\nTOTAL ROUNDS EXPENDED WERE: %d\n", S1)
+						if S1 > 18 {
+							print("BETTER GO BACK TO FORT SILL FOR REFRESHER TRAINING!")
+							return
+						} else {
+							print("NICE SHOOTING !!")
+							return
+						}
+					} else {
+						killedEnemies += 1
+						fmt.Println("\nTHE FORWARD OBSERVER HAS SIGHTED MORE ENEMY ACTIVITY...")
+						break
+					}
+				} else { // missed
+					if shotProximity > 100 {
+						fmt.Printf("SHORT OF TARGET BY %d YARDS.\n", int(math.Abs(float64(shotProximity))))
+					} else {
+						fmt.Printf("OVER TARGET BY %d YARDS.\n", int(math.Abs(float64(shotProximity))))
+					}
+				}
+			} else {
+				fmt.Print("\nBOOM !!!!   YOU HAVE JUST BEEN DESTROYED BY THE ENEMY.\n\n\n")
+				fmt.Println("BETTER GO BACK TO FORT SILL FOR REFRESHER TRAINING!")
+				return
+			}
+		}
+	}
+}
+
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	scanner := bufio.NewScanner(os.Stdin)
+
+	printIntro()
+
+	for {
+		play()
+
+		fmt.Print("TRY AGAIN (Y OR N)? ")
+		scanner.Scan()
+
+		if strings.ToUpper(scanner.Text())[0:1] != "Y" {
+			fmt.Println("\nOK. RETURN TO BASE CAMP.")
+			break
+		}
+	}
+}