Compilare: user.cpp: In function ‘int main()’: user.cpp:87:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[ch] = !f[ch]; ^ user.cpp:87:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[ch] = !f[ch]; ^ user.cpp: In function ‘bool Termen(char*&)’: user.cpp:34:12: warning: ‘answer’ may be used uninitialized in this function [-Wmaybe-uninitialized] return answer; ^~~~~~