0_0_26779020_25183.cpp: In function 'int main()':
0_0_26779020_25183.cpp:7:8: error: 'cin' was not declared in this scope
while(cin>>r)
^
0_0_26779020_25183.cpp:7:8: note: suggested alternative:
In file included from 0_0_26779020_25183.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note: 'std::cin'
extern istream cin; /// Linked to standard input
^
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