没有输入时，红宝石显示＃{}(ruby show #{} when nothing is entered)

没有输入时，红宝石显示＃{}(ruby show #{} when nothing is entered) print"Do you want to calculate your invoice? Please enter Yes(Y) or No(N)... " calculate_cont = "" while calculate_cont = gets.chomp() calculate_cont.to_s calculate_cont.upcase! case calculate_cont when "Y", "YES" <calculations> print "Do you wish to continue? " when "N", "NO" puts "Thank you! Press Enter to exit!" gets() exit() else puts "Error: #{calculate_cont} is not a valid entry! puts "Please Enter a valid response! Yes(Y) or No(N)" print "Do you wish to continue? " end end

当用户输入除YES或NO以外的任何其他内容时，它将使用＃{calculate_cont}显示他输入的文本。 如果用户只是使用＃{calculate_cont}按Enter键，我如何告诉用户他输入“Nothing”？ 能做到吗？

谢谢

print"Do you want to calculate your invoice? Please enter Yes(Y) or No(N)... " calculate_cont = "" while calculate_cont = gets.chomp() calculate_cont.to_s calculate_cont.upcase! case calculate_cont when "Y", "YES" <calculations> print "Do you wish to continue? " when "N", "NO" puts "Thank you! Press Enter to exit!" gets() exit() else puts "Error: #{calculate_cont} is not a valid entry! puts "Please Enter a valid response! Yes(Y) or No(N)" print "Do you wish to continue? " end end

when the user enter anything else other than YES or NO it will show the text that he input using #{calculate_cont}. How can i tell the user that he enters "Nothing" if the user just hit enter using #{calculate_cont}? can it be done?

Thanks

最满意答案

是的，如果您正在调用gets.chomp且用户未输入任何值，则输出将为空字符串。 只是换个条件

DO SOMETHING if calculate_cont.empty?

Yes, if you are calling gets.chomp and the user entered no value, the output will be an empty string. Just put another conditional

DO SOMETHING if calculate_cont.empty?