我正在尝试在控制台中开发战舰游戏。我需要输入猜猜游戏在哪里的坐标。我做到了：
#array1 and array2 are not obvious boards of player1 and player2 respectly
array1 = [ ['*', 'A', 'B', 'C', 'D', 'E'],['1',0, 1, 1, 1, 0], ['2',1, 0, 0, 0, 0], ['3',1, 0, 1, 0, 0], ['4',0, 0, 1, 0, 1], ['5',0, 0, 0, 0, 0] ]
array2 = [ ['*', 'A', 'B', 'C', 'D', 'E'],['1',1, 0, 1, 1, 0], ['2',0, 0, 0, 0, 1], ['3',0, 1, 0, 0, 1], ['4',0, 1, 0, 0, 1], ['5',0, 0, 0, 0, 0] ]
#arr1 and arr2 are obvious boards of player1 and player2 respectly
arr1 = [['*', 'A', 'B', 'C', 'D', 'E'],['1','.','.','.','.','.'],['2','.','.','.','.','.'],['3','.','.','.','.','.'],['4','.','.','.','.','.'],['5','.','.','.','.','.']]
arr2 = [['*', 'A', 'B', 'C', 'D', 'E'],['1', '.','.','.','.','.'],['2', '.','.','.','.','.'],['3', '.','.','.','.','.'],['4', '.','.','.','.','.'],['5', '.','.','.','.','.']]
coor = ['A', 'B', 'C', 'D', 'E']
#board1 and board2 are the final boards of player1 and player2
#this arrays will be seen during game
#every changes will be seen on these boards
board1 = arr1.map { |x| x.join(' ') }
board2 = arr2.map { |x| x.join(' ') }
#num1 and num2 are the numbers of the parts of ships respectively
num1 = 8
num2 = 8
#count1 and count2 are the numbers of poped ship parts respectively
count1 = 0
count2 = 0
#Starting of the game and the printing the board
#If we type "start" game will be started
#"Reset" game will be ended
#If we type words except "start" or "reset" program will ask "Do you want to start? (start/reset)" again
while true do
puts "Welcome to the game!!!"
puts "Do you want to start? (start/reset):"
respond = gets.chomp
if respond == 'start'
puts "\n"
puts "Player ONE"
puts board1
puts "\n"
puts "Player TWO"
puts board2
while true do
#Burada while ile player1 in shertleri olacaq
while true do
puts "\n"
puts "Turn - Player ONE"
puts "Enter coordinate: "
a = gets.chomp
a1 = a.split('')
b = coor.index(a1[0]) +1
col1 = b
row1= a1[1].to_i
if a == '""'
puts "You have to enter any coordinate"
break
elsif array1[row1][col1] == 'X' or array1[row1][col1] == '0'
puts "You have already bumped this coordinate!"
elsif col1<1 or col1>5 or row1>5 or row1<1
puts "This coordinate is out of board"
else
if array1[row1][col1] == 1
count1 = count1 + 1
arr1[row1][col1] = "X"
elsif array1[row1][col1] == 0
arr1[row1][col1] = "0"
end
board1 = arr1.map { |x| x.join(' ') }
puts "\n"
puts "Player ONE"
puts board1
puts "\n"
puts "Player TWO"
puts board2
if count1 == num1
puts "Player ONE won the game!"
break
end
end
break
end
while true do
#Burada while ile player2 in shertleri olacaq
puts "\n"
puts "Turn - Player TWO"
puts "Enter coordinate: "
c = gets.chomp
c1 = c.split('')
d = coor.index(c1[0]) + 1
col2 = d
row2= c1[1].to_i
if c == '""'
puts "You have to enter any coordinate"
break
elsif array2[row2][col2] == 'X' or array2[row2][col2] == '0'
puts "You have already bumped this coordinate!"
elsif col2<1 or col2>5 or row2>5 or row2<1
puts "This coordinate is out of board"
else
if array2[row2][col2] == 1
count2 = count2 + 1
arr2[row2][col2] = "X"
elsif array2[row2][col2] == 0
arr2[row2][col2] = "0"
end
board2 = arr2.map { |x| x.join(' ') }
puts "Player ONE"
puts board1
puts "\n"
puts "Player TWO"
puts board2
if count2 == num2
puts "Player TWO won the game!"
break
end
end
break
end
end
elsif respond == 'reset'
puts "You are off the game"
break
else
puts "\n"
puts "Answer can be only {start} or {reset}"
end
end
有一些问题，我在代码中添加了if elsif else条件来解决它们。其中一个用于在板外输入坐标，第二个用于不输入任何坐标，最后一个用于凹凸坐标。如果绕过这三个条件，则玩家可以输入任何坐标。
但是这些代码不起作用。当我检查这三个条件时，结果是一个错误。谁能告诉我这些情况是什么问题？他们为什么不给出合适的结果？
答案 0 :(得分：0)
输入A8作为值时，您得到的错误是：
battleship.rb:54:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError)
这是第54行：
elsif array1[row1][col1] == 'X' or array1[row1][col1] == '0'
在这种情况下，错误是array1 [“ 8”]为nil，而nil [“ A”]未定义。一种简单的解决方法是将第56行移到该行上方（该行用于检查输入是否确实在电路板范围内）。
elsif col1<1 or col1>5 or row1>5 or row1<1
如果这样做，则由于8大于5，您将获得“ out of board”消息，而不是错误。
您提到的另一个错误是当您输入空字符串时。在这种情况下，错误是：
battleship.rb:48:in `<main>': undefined method `+' for nil:NilClass (NoMethodError)
第48行说：
b = coor.index(a1[0]) +1
在这种情况下，索引返回nil，并且您不能将1加到nil。
解决此问题的一种方法是将该部分向下移动几行，以检查a是否为空白到第48行。