首先，我将重复您的代码格式已更正。 （缩进无处不在...缩进应该让代码更容易理解，而不是更难！如果您不能 100% 确定缩进是如何工作的，那么使用自动缩进功能您选择的编辑器。）
def birth_path_number(birth_date)
birth_date = birth_date[0].to_i + birth_date[1].to_i + birth_date[2].to_i + birth_date[3].to_i + birth_date[4].to_i + birth_date[5].to_i + birth_date[6].to_i + birth_date[7].to_i
birth_date = birth_date.to_s
second_number = birth_date[0].to_i + birth_date[1].to_i
if second_number > 9
then birth_date = second_number[0].to_i + second_number[1].to_i
else
birth_date = second_number.to_i
end
puts birth_date
end
def number(birth_date)
if birth_date == 1
then display_one = "One is the leader. The number one indicates the ability to stand alone and is a strong vibration. Ruled by the Sun."
elsif birth_date == 2
then display_one = "This is the mediator and peace-lover. The number two indicates the desire for harmony. It is a gentle, considerate, and sensitive vibration. Ruled by the Moon."
elsif birth_date == 3
then display_one = "Number Three is a sociable, friendly, and outgoing vibration. Kind, positive, and optimistic, Three's enjoy life and have a good sense of humor. Ruled by Jupiter."
elsif birth_date == 4
then display_one = "This is the worker. Practical, with a love of detail, Fours are trustworthy, hard-working, and helpful. Ruled by Uranus."
elsif birth_date == 5
then display_one = "This is the freedom lover. The number five is an intellectual vibration. These are 'idea' people with a love of variety and the ability to adapt to most situations. Ruled by Mercury."
elsif birth_date == 6
then display_one = "This is the peace lover. The number six is a loving, stable, and harmonious vibration. Ruled by Venus."
elsif birth_date == 7
then display_one = "This is the deep thinker. The number seven is a spiritual vibration. These people are not very attached to material things, are introspective, and generally quiet. Ruled by Neptune."
elsif birth_date == 8
then display_one = "This is the manager. Number Eight is a strong, successful, and material vibration. Ruled by Saturn."
elsif birth_date == 9
then display_one = "This is the teacher. Number Nine is a tolerant, somewhat impractical, and sympathetic vibration. Ruled by Mars."
end
puts display_one
end
puts "Write your birthday in the format MMDDYYYY"
birth_date = gets
birth_path_number(birth_date)
number(birth_date)
那么，您的主要错误是使用原始输入调用 number 方法（例如 "01282021"），而不是“出生路径编号”。或者换一种说法，与您的问题的标题相反，方法 is 被调用，但没有满足 if ... else if ... 条件 - 所以 display_one == nil 和一个空行正在打印到终端。
（如果你真的告诉我们这个任意的birth_path_number 值实际上应该代表什么，这也可能会有所帮助，否则我无法知道那部分代码是否正确！）
由于您当前编写代码的方式，这是不可避免的——因为birth_path_number 方法实际上并不返回值。这是对您的代码的最小更改，以使其“工作”。 （请注意，我已经重命名了几个方法/变量，只是为了让它更清楚发生了什么。）
def birth_path_number(birth_date)
birth_date = birth_date[0].to_i + birth_date[1].to_i + birth_date[2].to_i + birth_date[3].to_i + birth_date[4].to_i + birth_date[5].to_i + birth_date[6].to_i + birth_date[7].to_i
birth_date = birth_date.to_s
second_number = birth_date[0].to_i + birth_date[1].to_i
if second_number > 9
then second_number[0].to_i + second_number[1].to_i
else
second_number.to_i
end
end
def display_one(birth_path_number)
if birth_path_number == 1
then message = "One is the leader. The number one indicates the ability to stand alone and is a strong vibration. Ruled by the Sun."
elsif birth_path_number == 2
then message = "This is the mediator and peace-lover. The number two indicates the desire for harmony. It is a gentle, considerate, and sensitive vibration. Ruled by the Moon."
elsif birth_path_number == 3
then message = "Number Three is a sociable, friendly, and outgoing vibration. Kind, positive, and optimistic, Three's enjoy life and have a good sense of humor. Ruled by Jupiter."
elsif birth_path_number == 4
then message = "This is the worker. Practical, with a love of detail, Fours are trustworthy, hard-working, and helpful. Ruled by Uranus."
elsif birth_path_number == 5
then message = "This is the freedom lover. The number five is an intellectual vibration. These are 'idea' people with a love of variety and the ability to adapt to most situations. Ruled by Mercury."
elsif birth_path_number == 6
then message = "This is the peace lover. The number six is a loving, stable, and harmonious vibration. Ruled by Venus."
elsif birth_path_number == 7
then message = "This is the deep thinker. The number seven is a spiritual vibration. These people are not very attached to material things, are introspective, and generally quiet. Ruled by Neptune."
elsif birth_path_number == 8
then message = "This is the manager. Number Eight is a strong, successful, and material vibration. Ruled by Saturn."
elsif birth_path_number == 9
then message = "This is the teacher. Number Nine is a tolerant, somewhat impractical, and sympathetic vibration. Ruled by Mars."
end
puts message
end
puts "Write your birthday in the format MMDDYYYY"
birth_date = gets
birth_path_number = birth_path_number(birth_date)
puts birth_path_number
display_one(birth_path_number)
最后，这里对您的代码进行了稍微大一点的更改——我并没有大规模更改它的实际工作方式，只是想让它更简单、更清晰：
def birth_path_number(birth_date)
# Sum of digits
sum1 = birth_date.chars.map(&:to_i).sum
# Sum of digits again (in case the previous sum is greater than 9)
sum2 = sum1.digits.sum
# Sum of digits again (in case the previous sum is still greater than 9)
sum2.digits.sum
end
def message_one(birth_path_number)
case birth_path_number
when 1
"One is the leader. The number one indicates the ability to stand alone and is a strong vibration. Ruled by the Sun."
when 2
"This is the mediator and peace-lover. The number two indicates the desire for harmony. It is a gentle, considerate, and sensitive vibration. Ruled by the Moon."
when 3
"Number Three is a sociable, friendly, and outgoing vibration. Kind, positive, and optimistic, Three's enjoy life and have a good sense of humor. Ruled by Jupiter."
when 4
"This is the worker. Practical, with a love of detail, Fours are trustworthy, hard-working, and helpful. Ruled by Uranus."
when 5
"This is the freedom lover. The number five is an intellectual vibration. These are 'idea' people with a love of variety and the ability to adapt to most situations. Ruled by Mercury."
when 6
"This is the peace lover. The number six is a loving, stable, and harmonious vibration. Ruled by Venus."
when 7
"This is the deep thinker. The number seven is a spiritual vibration. These people are not very attached to material things, are introspective, and generally quiet. Ruled by Neptune."
when 8
"This is the manager. Number Eight is a strong, successful, and material vibration. Ruled by Saturn."
when 9
"This is the teacher. Number Nine is a tolerant, somewhat impractical, and sympathetic vibration. Ruled by Mars."
else
raise "Error: Unknown birth path number #{birth_path_number}"
end
end
puts "Write your birthday in the format MMDDYYYY"
birth_date = gets.chomp
birth_path_number = birth_path_number(birth_date)
puts birth_path_number
puts message_one(birth_path_number)