Compilare: user.c: In function 'minim_p': user.c:13: warning: array subscript has type 'char' user.c:13: warning: array subscript has type 'char' user.c:14: warning: array subscript has type 'char' user.c:14: warning: array subscript has type 'char' user.c: In function 'minim_r': user.c:20: warning: array subscript has type 'char' user.c:21: warning: array subscript has type 'char' user.c:22: warning: array subscript has type 'char' user.c:23: warning: array subscript has type 'char' user.c:24: warning: array subscript has type 'char' user.c:25: warning: array subscript has type 'char' user.c:26: warning: array subscript has type 'char' user.c: In function 'main': user.c:45: warning: implicit declaration of function 'read' user.c:128: warning: implicit declaration of function 'close'