Compilare: user.c: In function 'minim_p': user.c:34: warning: array subscript has type 'char' user.c:34: warning: array subscript has type 'char' user.c:35: warning: array subscript has type 'char' user.c:35: warning: array subscript has type 'char' user.c: In function 'minim_r': user.c:48: warning: array subscript has type 'char' user.c:49: warning: array subscript has type 'char' user.c:50: warning: array subscript has type 'char' user.c: In function 'minim_r2': user.c:63: warning: array subscript has type 'char' user.c:64: warning: array subscript has type 'char' user.c:65: warning: array subscript has type 'char' user.c: In function 'main': user.c:84: warning: implicit declaration of function 'read' user.c:238: warning: implicit declaration of function 'close'