miqiu1987 (服务器123123)

在 redhat 下安装 emacs 时，./configure 报错了，不知道该如何解决，麻烦高手指点一下

miqiu1987 — Fri, 09 Aug 2013 19:25:38 +0800

configure: error: You seem to be running X, but no X development libraries were found. You should install the relevant development files for X and for the toolkit you want, such as Gtk+, Lesstif or Motif. Also make sure you have development files for image handling, i.e. tiff, gif, jpeg, png and xpm. If you are sure you want Emacs compiled without X window support, pass --without-x to configure. 看网上说是需要安装 x 的 dev 库，但是不知道 redhat 能通过什么途径安装这个

ruby 是否支持递归呢？

miqiu1987 — Tue, 06 Aug 2013 20:57:33 +0800

class Fib_cal def initialize() puts "This is initialize!" end def fib(n) i,j,a=1,1,1 while a<n if(i<=j) i+=j else j+=i end a+=1 end if(i<=j) puts "#{i}" else puts "#{j}" end puts "fib end!" end def fib_simple(n) res = fib_simple(n-1)+fib_simple(n-2) puts "#{res}" puts "fib_simple end!" end def fib_list(n) i,j,a=1,1,1 res=[1,1] while a<=n if(i<=j) i+=j res[a+1] = i else j+=i res[a+1] = j end a+=1 end res.each{|i| puts i} puts "fib_list end!" end end

fib_test = Fib_cal.new fib_test.fib(5) fib_test.fib_list(5) fib_test.fib_simple(5)

运行报错了： Fib_cal.rb:23:in fib_simple': stack level too deep (SystemStackError) from Fib_cal.rb:23:infib_simple' from Fib_cal.rb:48 This is initialize! 5 fib end! 1 1 2 3 5 8 13 fib_list end!

初学 ruby，看不出来为什么报错了

miqiu1987 — Tue, 06 Aug 2013 20:25:38 +0800

class Leap_year def initialize puts 'Please input a year:' end def leap_year?(year) @year = year if @year % 400 == 0 puts 'Leap year!' elsif @year % 4 == 0 && @year % 100 != 0 puts 'Leap year!' else puts 'Not a leap year' end end end

leap = Leap_year.new testyear=gets.chomp.to_i leap.leap_year?(testyear)

报错信息： leap_year.rb:18: private method `chomp' called for nil:NilClass (NoMethodError) Please input a year: 初步怀疑是这里的问题 testyear=gets.chomp.to_i，但是不明白是什么问题，请大牛们指点指点。