Compilare: user.c: In function ‘main’: user.c:16:5: warning: implicit declaration of function ‘ciur’ [-Wimplicit-function-declaration] ciur(n); ^ user.c: At top level: user.c:23:6: warning: conflicting types for ‘ciur’ [enabled by default] void ciur (int x) ^ user.c:16:5: note: previous implicit declaration of ‘ciur’ was here ciur(n); ^