Compilare: user.cpp: In function 'bool eq(char*)': user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'bool factor(int&)': user.cpp:42: warning: deprecated conversion from string constant to 'char*' user.cpp:44: warning: deprecated conversion from string constant to 'char*' user.cpp:46: warning: deprecated conversion from string constant to 'char*' user.cpp:48: warning: array subscript has type 'char' user.cpp: In function 'bool eval(int&)': user.cpp:58: warning: deprecated conversion from string constant to 'char*' user.cpp:60: warning: deprecated conversion from string constant to 'char*' user.cpp: In function 'int main()': user.cpp:77: warning: array subscript has type 'char' user.cpp:77: warning: array subscript has type 'char'