Flipping bits game: Difference between revisions

=={{header|Kotlin}}==

<lang scala>// version 1.1.3

import java.util.Random

val rand = Random()

val target = Array(3) { IntArray(3) { rand.nextInt(2) } }

val board = Array(3) { IntArray(3) }

fun flipRow(r: Int) {

for (c in 0..2) board[r][c] = if (board[r][c] == 0) 1 else 0

}

fun flipCol(c: Int) {

for (r in 0..2) board[r][c] = if (board[r][c] == 0) 1 else 0

}

/** starting from the target we make 9 random row or column flips */

fun initBoard() {

for (i in 0..2) {

for (j in 0..2) board[i][j] = target[i][j]

}

repeat(9) {

val rc = rand.nextInt(2)

if (rc == 0)

flipRow(rand.nextInt(3))

else

flipCol(rand.nextInt(3))

}

}

fun printBoard(label: String, isTarget: Boolean = false) {

val a = if (isTarget) target else board

println("$label:")

println(" | a b c")

println("---------")

for (r in 0..2) {

print("${r + 1} |")

for (c in 0..2) print(" ${a[r][c]}")

println()

}

println()

}

fun gameOver(): Boolean {

for (r in 0..2) {

for (c in 0..2) if (board[r][c] != target[r][c]) return false

}

return true

}

fun main(args: Array<String>) {

initBoard()

printBoard("TARGET", true)

printBoard("OPENING BOARD")

var flips = 0

do {

var isRow = true

var n = -1

do {

print("Enter row number or column letter to be flipped: ")

val input = readLine()!!

val ch = if (input.length > 0) input[0].toLowerCase() else '0'

if (ch !in "123abc") {

println("Must be 1, 2, 3, a, b or c")

continue

}

if (ch in '1'..'3') {

n = ch.toInt() - 49

}

else {

isRow = false

n = ch.toInt() - 97

}

}

while (n == -1)

flips++

if (isRow) flipRow(n) else flipCol(n)

val plural = if (flips == 1) "" else "S"

printBoard("\nBOARD AFTER $flips FLIP$plural")

}

while (!gameOver())

val plural = if (flips == 1) "" else "s"

println("You've succeeded in $flips flip$plural")

}</lang>

{{out}}

A sample game:

<pre>

TARGET:

| a b c

---------

1 | 0 1 0

2 | 0 1 0

3 | 1 1 1

OPENING BOARD:

| a b c

---------

1 | 1 0 0

2 | 0 1 1

3 | 0 0 1

Enter row number or column letter to be flipped: 1

BOARD AFTER 1 FLIP:

| a b c

---------

1 | 0 1 1

2 | 0 1 1

3 | 0 0 1

Enter row number or column letter to be flipped: 3

BOARD AFTER 2 FLIPS:

| a b c

---------

1 | 0 1 1

2 | 0 1 1

3 | 1 1 0

Enter row number or column letter to be flipped: c

BOARD AFTER 3 FLIPS:

| a b c

---------

1 | 0 1 0

2 | 0 1 0

3 | 1 1 1

You've succeeded in 3 flips!

</pre>