arrays - 不能将字符串强制转换为 Fixnum

Question

我在这一行有这个错误(if change_needed - coins[i] >= 0 then )

String can't be coerced into Fixnum

从我的代码来看，我不明白为什么它现在不能工作。任何有关如何最好地解决此问题的帮助将不胜感激。

user_input = gets
change_needed = 0
coins = []

coins_part, change_needed_part = user_input.split(':')
coins = coins_part.split(',')
change_needed = change_needed_part.to_i

i = 0
coins_used = []

while change_needed != 0 do
  if change_needed - coins[i] >= 0 then
    change_needed = change_needed - coins[i]
    coins_used << coins[i]
  else
    i += 1
  end
end

Answer 1

coins 是一个 String 数组，当您尝试用 coins[i] 进行算术运算时。

改变

coins = coins_part.split(',')

到

coins = coins_part.split(',').map(&:to_i)