Compilare: user.c: In function 'form': user.c:16: warning: unused variable 'nn' user.c: In function 'main': user.c:33: warning: format '%d' expects type 'int *', but argument 3 has type 'long int *' user.c:33: warning: format '%d' expects type 'int *', but argument 4 has type 'long int *' user.c:33: warning: format '%d' expects type 'int *', but argument 5 has type 'long int *' user.c:37: warning: format '%d' expects type 'int *', but argument 3 has type 'long int *' user.c: In function 'form': user.c:16: warning: 'j' may be used uninitialized in this function