This an algorithm c++ seek happy number, easy to understand, are interested can look at

happynumber
...........\Debug
...........\.....\happynumber.exe
...........\.....\happynumber.exe.manifest
...........\.....\happynumber.ilk
...........\.....\happynumber.pdb
...........\happynumber
...........\...........\Debug
...........\...........\.....\CL.read.1.tlog
...........\...........\.....\CL.write.1.tlog
...........\...........\.....\happynumber.exe.intermediate.manifest
...........\...........\.....\happynumber.lastbuildstate
...........\...........\.....\happynumber.log
...........\...........\.....\happynumber.obj
...........\...........\.....\happynumber.vcxprojResolveAssemblyReference.cache
...........\...........\.....\happynumber.write.1.tlog
...........\...........\.....\link.3500.read.1.tlog
...........\...........\.....\link.3500.write.1.tlog
...........\...........\.....\link.4164.read.1.tlog
...........\...........\.....\link.4164.write.1.tlog
...........\...........\.....\link.4812.read.1.tlog
...........\...........\.....\link.4812.write.1.tlog
...........\...........\.....\link.4876.read.1.tlog
...........\...........\.....\link.4876.write.1.tlog
...........\...........\.....\link.5028.read.1.tlog
...........\...........\.....\link.5028.write.1.tlog
...........\...........\.....\link.read.1.tlog
...........\...........\.....\link.write.1.tlog
...........\...........\.....\mt.read.1.tlog
...........\...........\.....\mt.write.1.tlog
...........\...........\.....\vc100.idb
...........\...........\.....\vc100.pdb
...........\...........\happynumber.cpp
...........\...........\happynumber.vcxproj
...........\...........\happynumber.vcxproj.filters
...........\...........\happynumber.vcxproj.user
...........\happynumber.sdf
...........\happynumber.sln
...........\happynumber.suo
...........\ipch
...........\....\happynumber-1ed7a227
...........\....\....................\happynumber-233c8637.ipch

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