All editors listed below are all free, cross-platfrom, and open-sourced:
1. jEdit (http://www.jedit.org) ** strongly recommended **
2. eclipse (http://www.eclipse.org)
3. vim (http://www.vim.org)
If you are learing C programming in Windows, I think VC+ would be enough.
(sorry, I cannot input chinese characters. :P)
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