Compilare: user.c: In function ‘power’: user.c:12:13: warning: implicit declaration of function ‘own_multiply’ [-Wimplicit-function-declaration] own_multiply(); ^ user.c:13:13: warning: implicit declaration of function ‘multiply’ [-Wimplicit-function-declaration] multiply(); ^ user.c: At top level: user.c:21:6: warning: conflicting types for ‘own_multiply’ [enabled by default] void own_multiply() { ^ user.c:12:13: note: previous implicit declaration of ‘own_multiply’ was here own_multiply(); ^ user.c:33:6: warning: conflicting types for ‘multiply’ [enabled by default] void multiply() { ^ user.c:13:13: note: previous implicit declaration of ‘multiply’ was here multiply(); ^ user.c: In function ‘main’: user.c:52:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^