Compilare: main.cpp: In function 'bool real_eval(std::__cxx11::string)': main.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < a.size() - 1 ; f ++) ~~^~~~~~~~~~~~~~ main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < a.size() ; f ++) ~~^~~~~~~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < a.size() ; f ++) ~~^~~~~~~~~~ main.cpp:85:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < a.size() ; f ++) ~~^~~~~~~~~~ main.cpp: In function 'bool evaluare(std::__cxx11::string)': main.cpp:171:62: warning: array subscript has type 'char' [-Wchar-subscripts] numere.push_back(frecv[ptr[f]] + '0') ; ^ main.cpp: In function 'int main()': main.cpp:218:19: warning: array subscript has type 'char' [-Wchar-subscripts] frecv[b[f]] = !frecv[b[f]] ; ^ main.cpp:218:34: warning: array subscript has type 'char' [-Wchar-subscripts] frecv[b[f]] = !frecv[b[f]] ; ^ main.cpp: In function 'bool real_eval(std::__cxx11::string)': main.cpp:109:20: warning: 'rezz' may be used uninitialized in this function [-Wmaybe-uninitialized] return rezz == '1' ; ^~~ main.cpp:49:5: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] if(semn == '|') ^~ main.cpp:83:15: note: 'semn' was declared here int rezz, semn ; ^~~~