Compilare: user.cpp:110:2: warning: no newline at end of file user.cpp: In function 'int factor(char*, int&, int)': user.cpp:32: warning: array subscript has type 'char' user.cpp:44: warning: array subscript has type 'char' user.cpp: In function 'void read_data()': user.cpp:86: warning: array subscript has type 'char' user.cpp:90: warning: array subscript has type 'char' user.cpp: In function 'void write_data()': user.cpp:100: warning: format '%ld' expects type 'long int', but argument 2 has type 'int' /tmp/ccd7GZIh.o: In function `read_data()': user.cpp:(.text+0x2d7): warning: the `gets' function is dangerous and should not be used.