why I click run on the VC 2010, the console box always saies that the file is out of date
Consider going to microsoft.
Thats because you edited the file and the project was out of date. Just check the "always build" button and you'll be all set.
"Run" means run the exe. VS knows enough that maybe you wanted the latest build, and when it sees you have edited the source asks if you want to re-compile.
You can also hit F7 and just compile.
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