Ruby -- If Elsif Else 错误

Question

我在这里遇到一个简单的 if else 链错误，我无法弄清楚发生了什么。前几天我开始学习 ruby​​，我已经了解一些 java，只是想重新编写程序以更快地学习 ruby​​。我正在尝试计算元音和辅音。不管怎样，这是我的代码...

#!/usr/bin/ruby/
alphabet = 'abcdefghijklmnopqrstuvwxyz'

array = alphabet.chars.to_a
vowel = 0
cons = 0
puts array.at(1)
for i in 0...26 
    if array.at(i) == "a"
        vowel++   
    elsif array.at(i) == 'e'
        vowel++
        elsif array.at(i) == 'i'
        vowel++
    elsif array.at(i) == 'o'
        vowel++
    elsif array.at(i) == 'u'
        vowel++
    else
        cons++
    end#end if else chain
end#end for loop

puts 'Vowel: ' + vowel.to_s
puts 'Consonants: ' + cons.to_s

这是我遇到的错误:

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:11: syntax error, unexpected keyword_elsif elsif array.at(i) == 'e' ^

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:13: syntax error, unexpected keyword_elsif elsif array.at(i) == 'i' ^

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:15: syntax error, unexpected keyword_elsif elsif array.at(i) == 'o' ^

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:17: syntax error, unexpected keyword_elsif elsif array.at(i) == 'u' ^

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:19: syntax error, unexpected keyword_else

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:21: syntax error, unexpected keyword_end

C:/Users/Kelan/Documents/Programming/Ruby Files/Little Programs/Alphabet.rb:25: syntax error, unexpected $end, expecting keyword_end puts 'Consonants: ' + cons.to_s ^

[Finished in 0.203 seconds]

我敢肯定这只是一些愚蠢的事情，但我一直在网上寻找帮助并且我听说过你们很棒的社区，所以我想我会在这里尝试，

可兰

Answer 1

Ruby 中没有++ 运算符。你应该使用 += 1 您可能还想了解 case 语句:

alphabet = 'abcdefghijklmnopqrstuvwxyz'

26.times do |i|
    case alphabet[i]
        when 'a' then vowel += 1
        when 'e' then vowel += 1
        when 'i' then vowel += 1
        when 'o' then vowel += 1
        when 'u' then vowel += 1
        else cons += 1
    end#end case
end#end times

puts 'Vowel: ' + vowel.to_s
puts 'Consonants: ' + cons.to_s

或者，更好的是，使用类 String 中的方法 count，如下所示:

alphabet = 'abcdefghijklmnopqrstuvwxyz'
vowels = 'aeiou'
vowel_count = alphabet.count vowels
cons_count = alphabet.length - vowel_count
puts "Vowels: #{vowel_count}"
puts "Consonants: #{cons_count}"