ruby - 如何写回文支票？

Question

我目前正在通过一些程序来学习 Ruby。我一直在研究回文程序，但无论输入(回文)如何，我最终都会在 else 上结束。

这是我一直在尝试的一些代码:

print "enter a string:\n"
string = gets
if string.reverse == string 
  print "it's a palindrome"
else 
  print "not a palindrome.\n"
end

非常感谢任何帮助/建议。

Answer 1

换行符没有从字符串中删除。试试这个代码:

print "enter a string:\n"
string = gets.chomp
    if string.reverse == string 
        print "it's a palindrome"
    else 
        print "not a palindrome.\n"
    end

这里有一些解释:

>> string = gets
racecar # input string
=> "racecar\n"
>> "racecar\n" == "racecar\n".reverse # "racecar\n" is not a palindrome with newline character
=> false
>> string = gets.chomp # chomp method deletes newline character
racecar
=> "racecar"
>> "racecar" == "racecar".reverse # "racecar" without a newline character is a palindrome
=> true