Compilare: user.cpp: In function 'void formsol()': user.cpp:36: warning: array subscript has type 'char' user.cpp:37: warning: array subscript has type 'char' user.cpp:39: warning: array subscript has type 'char' user.cpp:40: warning: array subscript has type 'char' user.cpp:44: warning: array subscript has type 'char' user.cpp:45: warning: array subscript has type 'char' user.cpp:47: warning: array subscript has type 'char' user.cpp:48: warning: array subscript has type 'char' /tmp/cc4bdZGO.o: In function `main': user.cpp:(.text+0x3ef): warning: the `gets' function is dangerous and should not be used.