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20.04.2016

std::endl replaced by '\n'. This is coherent with the C++ Core Guidelines (SL.50: Avoid endl)
http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines. 
using namespace std removed: As a result
1. std:: added 
2. ::isspace replaced by isspace, warning added: using namespace std goes with ::isspace
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