Compilare: user.cpp: In function 'void rezolva()': user.cpp:77: warning: array subscript has type 'char' user.cpp:123: warning: array subscript has type 'char' user.cpp:123: warning: array subscript has type 'char' user.cpp:124: warning: array subscript has type 'char' user.cpp: In function 'char factor()': user.cpp:41: warning: 'x' may be used uninitialized in this function