Compilare: user.cpp: In function ‘bool solveOR()’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool solveAND()’: user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool solveNUMBER()’: user.cpp:61: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:81: warning: array subscript has type ‘char’ user.cpp:81: warning: array subscript has type ‘char’