Compilare: user.c: In function ‘main’: user.c:117:11: warning: variable ‘in’ set but not used [-Wunused-but-set-variable] FILE *in; ^ user.c:116:9: warning: unused variable ‘w’ [-Wunused-variable] int w; ^ user.c:115:9: warning: unused variable ‘d’ [-Wunused-variable] int d; ^ user.c:114:9: warning: unused variable ‘v’ [-Wunused-variable] int v; ^ user.c:113:9: warning: unused variable ‘u’ [-Wunused-variable] int u; ^ user.c:112:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^