Bulls and cows: Difference between revisions
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→{{header|Go}}: library path update |
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=={{header|Go}}==
<lang go>package main
import (
"bufio"
"bytes"
"fmt"
"math/rand"
"os"
"strings"
)
func main() {
fmt.Println(`Cows and Bulls
Guess four digit number of unique digits in the range 1 to 9.
A correct digit but not in the correct place is a cow.
A correct digit in the correct place is a bull.`)
// generate pattern
pat := make([]byte, 4)
n, _, _ := os.Time()
rand.Seed(n)
r := rand.Perm(9)
for i := range pat {
pat[i] = '1' + byte(r[i])
}
// accept and score guesses
valid := []byte("123456789")
guess:
for in := bufio.NewReader(os.Stdin); ; {
fmt.Print("Guess: ")
guess, err := in.ReadString('\n')
if err != nil {
fmt.Println("\nSo, bye.")
return
}
guess = strings.TrimSpace(guess)
if len(guess) != 4 {
// malformed: not four characters
fmt.Println("Please guess a four digit number.")
continue
}
var cows, bulls int
for ig, cg := range guess {
if strings.IndexRune(guess[:ig], cg) >= 0 {
// malformed: repeated digit
fmt.Printf("Repeated digit: %c\n", cg)
continue guess
}
switch bytes.IndexByte(pat, byte(cg)) {
case -1:
if bytes.IndexByte(valid, byte(cg)) == -1 {
// malformed: not a digit
fmt.Printf("Invalid digit: %c\n", cg)
continue guess
}
default: // I just think cows should go first
cows++
case ig:
bulls++
}
}
fmt.Printf("Cows: %d, bulls: %d\n", cows, bulls)
if bulls == 4 {
fmt.Println("You got it.")
return
}
}
}</lang>
'''Alternate Solution'''
<lang go>package main
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}</lang>
=={{header|Haskell}}==
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