Compilare: user.c: In function 'preproc': user.c:17: warning: array subscript has type 'char' user.c: In function 'main': user.c:34: warning: format '%d' expects type 'int *', but argument 3 has type 'short int *' user.c:39: warning: array subscript has type 'char' user.c:39: warning: array subscript has type 'char' user.c:43: warning: array subscript has type 'char' user.c:25: warning: unused variable 'w'