Question

不确定我为什么会收到此错误。这是代码：

puts "Please input an integer"
puts ">>> A positive input stores how many numbers are >, < or = to 1000"
puts ">>> -1 terminates the application and outputs how many numbers were >, < or = to 1000"

num = gets.chomp

i = num.to_i

while num != "-1"

    if i > 1000
        greater += 1
    elsif i < 1000
        less += 1
    elsif i == 1000
        equal += 1
    elsif i < 0
        puts "Please only enter positive integers"
    end
end

puts "Number of integers greater than 1000 = #{greater}"
puts "Number of intergers less than 1000 = #{less}"
puts "Number of integers equal to 1000 = #{equal}"

gets

代码显然是在尝试比较输入的数字以查看它们是否大于，小于或等于1000，然后将它们存储在输入-1后显示的变量中。

Answer 1

您尚未初始化greater，less和equal个变量。尝试添加

greater = 0
less = 0
equal = 0

或者，如果您更喜欢使用多个作业的较短版本

greater = less = equal = 0

在while循环之前

（eval）：13：nil的未定义方法`+'：NilClass（NoMethodError）

1 个答案: