virgule.cpp: In function 'bool Check()': virgule.cpp:9: error: 'bool BigNr::operator<(BigNr&)' is private virgule.cpp:24: error: within this context virgule.cpp:25: warning: comparison between signed and unsigned integer expressions virgule.cpp:9: error: 'bool BigNr::operator<(BigNr&)' is private virgule.cpp:26: error: within this context virgule.cpp:9: error: 'bool BigNr::operator<(BigNr&)' is private virgule.cpp:27: error: within this context virgule.cpp: In function 'void Back(int)': virgule.cpp:33: error: 's' was not declared in this scope