Compilare: user.cpp: In function `int main()': user.cpp:38: warning: array subscript has type `char' user.cpp:39: warning: array subscript has type `char' user.cpp:42: warning: array subscript has type `char' user.cpp:43: warning: array subscript has type `char' /tmp/ccurSFvP.o(.text+0x14d): In function `main': : warning: the `gets' function is dangerous and should not be used.