Compilare: user.c: In function ‘main’: user.c:7: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘long unsigned int *’ user.c:17: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ user.c:17: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long unsigned int’ user.c:18: warning: implicit declaration of function ‘system’ user.c:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result