Compilare: user.cpp: In function ‘bool sau()’: user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i]=="OR") ^ user.cpp: In function ‘bool si()’: user.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i]=="AND") ^ user.cpp: In function ‘bool nu()’: user.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i]=="NOT") ^ user.cpp: In function ‘bool exp()’: user.cpp:60:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size() && s[i]=="(") ^ user.cpp:67:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size() && s[i]=="TRUE") ^ user.cpp:73:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size() && s[i]=="FALSE") ^ user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size()) ^ user.cpp:81:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] rez=lit[s[i][0]]; ^ user.cpp: In function ‘int main()’: user.cpp:98:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<aux.size();j++) ^ user.cpp:134:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] lit[aux[j]]=1-lit[aux[j]]; ^ user.cpp:134:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] lit[aux[j]]=1-lit[aux[j]]; ^