Compilare: user.c: In function ‘prim’: user.c:14: warning: implicit declaration of function ‘marcare’ user.c: At top level: user.c:17: warning: conflicting types for ‘marcare’ user.c:14: note: previous implicit declaration of ‘marcare’ was here user.c: In function ‘main’: user.c:45: warning: format ‘%u’ expects type ‘unsigned int’, but argument 3 has type ‘long long unsigned int’ user.c:27: warning: unused variable ‘val’ user.c:33: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result