c++ seek distance between two points on the earth, through the great circle azimuth algorithm

GCdis_hea\GCdis_hea\gcdis_hea.cpp
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.........\.........\.eneratedFiles\Debug\moc_gcdis_hea.cpp
.........\.........\..............\qrc_gcdis_hea.cpp
.........\.........\..............\ui_gcdis_hea.h
.........\.........\main.cpp
.........\GCdis_hea.ncb
.........\GCdis_hea.sln
.........\GCdis_hea.suo
.........\Win32\Debug\BuildLog.htm
.........\.....\.....\GCdis_hea.exe
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.........\.....\.....\GCdis_hea.ilk
.........\.....\.....\gcdis_hea.obj
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.........\.....\.....\main.obj
.........\.....\.....\moc_gcdis_hea.obj
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.........\.....\.....\vc90.idb
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.........\GCdis_hea\GeneratedFiles\Debug
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.........\.........\GeneratedFiles
.........\.........\Resources
.........\Win32\Debug
.........\GCdis_hea
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GCdis_hea

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