Compilare: main.cpp: In member function 'void expr::gradnot()': main.cpp:28:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ops.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In member function 'void expr::gradand()': main.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tmp1.size() - 1; i += 2) ~~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'operand expr::grador()': main.cpp:52:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tmp2.size(); i += 2) ~~^~~~~~~~~~~~~ main.cpp: In function 'void addOperand(std::vector<operand>&, const string&)': main.cpp:92:26: warning: array subscript has type 'char' [-Wchar-subscripts] v.push_back(vars[val[0]] == 1 ? TRUE : FALSE); ^ main.cpp: In function 'int main()': main.cpp:156:9: warning: array subscript has type 'char' [-Wchar-subscripts] vars[a] ^= 1; ^