|
}
}
}</lang>
'''Alternate Solution'''
<lang go>package main
import (
. "fmt"
"rand"
"time"
"os"
"bufio"
"strconv"
"strings"
)
func generateTarget() int {
rand.Seed(time.Nanoseconds())
// loop until we find a number that doesn't have dupes
for {
target := rand.Intn(9000) + 1000
if !hasDupes(target) {
return target
}
}
panic("Crap.")
}
func hasDupes(num int) bool {
digs := make([]bool, 10)
for num > 0 {
if digs[num%10] {
return true
}
digs[num%10] = true
num /= 10
}
return false
}
func askForNumber() (int, os.Error) {
in := bufio.NewReader(os.Stdin)
for {
Print("Give me a number: ")
line, err := in.ReadString('\n')
if err != nil {
return -1, err
}
// Strip off the \n
line = line[0 : len(line)-1]
number, err := strconv.Atoi(line)
switch {
case err != nil:
Println("Give me a number fule!")
case number < 1000:
Println("Number not long enough")
case number > 9999:
Println("Number is to big")
case hasDupes(number):
Println("I said no dupes!")
default:
return number, nil
}
// Keep Asking
}
panic("Crap.")
}
func bullsAndCows(number int, guess int) (bulls int, cows int) {
bulls, cows = 0, 0
numberstr := strconv.Itoa(number)
guessstr := strconv.Itoa(guess)
for i := range guessstr {
s := string(guessstr[i])
switch {
case guessstr[i] == numberstr[i]:
bulls++
case strings.Index(numberstr, s) >= 0:
cows++
}
}
return;
}
func main() {
attempts := 0
Print("I choose a number made of 4 digits (from 1 to 9) without repetitions\n"
"You enter a number of 4 digits, and I say you how many of them are\n"
"in my secret number but in wrong position (cows or O), and how many\n"
"are in the right position (bulls or X)\n\n")
target := generateTarget()
for {
guess, err := askForNumber()
attempts++
// Handle err
if err != nil && err != os.EOF {
Print(err)
} else if err == os.EOF {
return
}
// Check if target matches guess
if guess == target {
Printf("Congratulations you guessed correctly in %d attempts\n", attempts)
return
}
bulls, cows := bullsAndCows(target, guess)
Printf("%d Bulls, %d Cows\n", bulls, cows)
}
}</lang>
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