Compilare: user.c: In function 'main': user.c:29: warning: format '%lu' expects type 'long unsigned int *', but argument 3 has type 'int *' user.c:30: warning: format '%lu' expects type 'long unsigned int *', but argument 3 has type 'int *' user.c:31: warning: format '%lu' expects type 'long unsigned int *', but argument 3 has type 'int *' user.c:35: warning: format '%lu' expects type 'long unsigned int *', but argument 3 has type 'int *' user.c:35: warning: format '%lu' expects type 'long unsigned int *', but argument 4 has type 'int *' user.c:61: warning: format '%lu' expects type 'long unsigned int', but argument 3 has type 'int'