Finally he again picked up the courage to "c programming",After installing xcode but found there were no gcc series stuff,,,depressed,Google's Internet,Have solutions
The solution is to Preferences > Downloads > Command Line Tools > Install
Hehe,Because finding a friend experiencing the same problem,In his originalHere,There is another solution。
Original article written by LogStudio:R0uter's Blog » Xcode 4.3 with NO GCC!?
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