yz00 (yangzhen)

写了一段 Ruby 代码，但是运行卡住，循环问题

yz00 — Tue, 09 Jun 2015 00:00:40 +0800

2520 is the smallest nuber that can be diveded by each of the number from 1 to 10 without any remainder. what is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20? 朋友发来一道题来做，我一看原来是求 1 到 20 的最小公倍数，然后就写了下面的代码，运行之后输入 20 就卡住了，出不来结果，但是输得数字小点就可以算出来，是不是我的循环写的有问题，想请大家帮忙看下怎么优化一下，有资料最好（本人用的 rubyV2.1.5）

b=Array.new
c= gets.chomp
a=1..c.to_i
jc=1
a.each do |elem|  
    b<<elem.to_i
end
b.each do |e|         #阶乘
    jc *= e 
end
x=b.max 
co = 1*x
x.upto(jc) do |i|         
        sum=0
        b.each do |f|
            sum = (i%f) +sum
        end
        if sum == 0
            co = i
            break
    end
end
puts "The common multiple is #{co}"

Git 问题来请教下，谢谢大家给看看

yz00 — Sat, 14 Feb 2015 19:52:21 +0800

yz00@yz00-Ideapad-Z460:~/sandbox$ touch a.rb yz00@yz00-Ideapad-Z460:~/sandbox$ touch b.rb yz00@yz00-Ideapad-Z460:~/sandbox$ git add a.rb yz00@yz00-Ideapad-Z460:~/sandbox$ git commit "Update a" error: pathspec 'Update a' did not match any file(s) known to git.

为什么会报这个错呢？教程里也没说，就来问下

安装 mysql2 报错，大家帮忙看下，么么哒

yz00 — Sat, 14 Feb 2015 01:43:22 +0800

安装好 rails 之后，安装 mysql2 报错，如果能教下我怎么看这种错，重点在哪就万分感谢了！ yz00@yz00-Ideapad-Z460:~$ gem install mysql2 Fetching: mysql2-0.3.17.gem (100%) Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension.

/home/yz00/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150214-27543-1td7th9.rb extconf.rb checking for ruby/thread.h... yes checking for rb_thread_call_without_gvl() in ruby/thread.h... yes checking for rb_thread_blocking_region()... no checking for rb_wait_for_single_fd()... yes checking for rb_hash_dup()... yes checking for rb_intern3()... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.

Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/yz00/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME) --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysql-config --without-mysql-config --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysqlclientlib --without-mysqlclientlib --with-mlib --without-mlib --with-mysqlclientlib --without-mysqlclientlib --with-zlib --without-zlib --with-mysqlclientlib --without-mysqlclientlib --with-socketlib --without-socketlib --with-mysqlclientlib --without-mysqlclientlib --with-nsllib --without-nsllib --with-mysqlclientlib --without-mysqlclientlib --with-mygcclib --without-mygcclib --with-mysqlclientlib --without-mysqlclientlib

extconf failed, exit code 1

Gem files will remain installed in /home/yz00/.rvm/gems/ruby-2.2.0/gems/mysql2-0.3.17 for inspection. Results logged to /home/yz00/.rvm/gems/ruby-2.2.0/extensions/x86-linux/2.2.0/mysql2-0.3.17/gem_make.out

求助，安装 rails 失败

yz00 — Fri, 13 Feb 2015 11:35:19 +0800

root@yz00-Ideapad-Z460:~# gem source -r https://rubygems.org/ https://rubygems.org/ removed from sources root@yz00-Ideapad-Z460:~# gem source -l *** CURRENT SOURCES ***

root@yz00-Ideapad-Z460:~# gem source -a http://ruby.taobao.org http://ruby.taobao.org added to sources root@yz00-Ideapad-Z460:~# gem source -l *** CURRENT SOURCES ***

http://ruby.taobao.org root@yz00-Ideapad-Z460:~# gem install rails Fetching: i18n-0.7.0.gem (100%) Successfully installed i18n-0.7.0 Fetching: thread_safe-0.3.4.gem (100%) Successfully installed thread_safe-0.3.4 Fetching: tzinfo-1.2.2.gem (100%) Successfully installed tzinfo-1.2.2 Fetching: minitest-5.5.1.gem (100%) Successfully installed minitest-5.5.1 Fetching: activesupport-4.2.0.gem (100%) Successfully installed activesupport-4.2.0 Fetching: rack-1.6.0.gem (100%) Successfully installed rack-1.6.0 Fetching: rack-test-0.6.3.gem (100%) Successfully installed rack-test-0.6.3 Fetching: mini_portile-0.6.2.gem (100%) Successfully installed mini_portile-0.6.2 Fetching: nokogiri-1.6.6.2.gem (100%) Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension.

/usr/local/bin/ruby -r ./siteconf20150213-4741-m4wolb.rb extconf.rb checking if the C compiler accepts ... yes Building nokogiri using packaged libraries. *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.

Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/local/bin/ruby --help --clean --use-system-libraries /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:in require': cannot load such file -- openssl (LoadError) from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from /usr/local/lib/ruby/2.1.0/net/https.rb:22:in <top (required)>' from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:in require' from /usr/local/lib/ruby/gems/2.1.0/gems/mini_portile-0.6.2/lib/mini_portile.rb:3:in' from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:128:in require' from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:128:inrescue in require' from /usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:39:in require' from extconf.rb:395:in

extconf failed, exit code 1

Gem files will remain installed in /usr/local/lib/ruby/gems/2.1.0/gems/nokogiri-1.6.6.2 for inspection. Results logged to /usr/local/lib/ruby/gems/2.1.0/extensions/x86-linux/2.1.0-static/nokogiri-1.6.6.2/gem_make.out

安装 rails 时报错，就报这个错，大家帮忙看下，万分感谢！