Compilare: user.c: In function ‘prim’: user.c:15: warning: implicit declaration of function ‘marcare’ user.c: At top level: user.c:18: warning: conflicting types for ‘marcare’ user.c:15: note: previous implicit declaration of ‘marcare’ was here user.c: In function ‘main’: user.c:51: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:71: warning: control reaches end of non-void function