Compilare: user.cpp:98:2: warning: no newline at end of file user.cpp: In function 'int factor(char*, int&, int)': user.cpp:30: warning: array subscript has type 'char' user.cpp:42: warning: array subscript has type 'char' user.cpp: In function 'void read_data()': user.cpp:83: warning: array subscript has type 'char' user.cpp:87: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:96: warning: format '%ld' expects type 'long int', but argument 2 has type 'int'