Compilare: user.c: In function 'repr': user.c:20: warning: implicit declaration of function 'memset' user.c:20: warning: incompatible implicit declaration of built-in function 'memset' user.c: In function 'main': user.c:48: warning: format '%d' expects type 'int *', but argument 3 has type 'long int *' user.c:48: warning: format '%d' expects type 'int *', but argument 4 has type 'long int *' user.c:51: warning: operation on 'n' may be undefined