Compilare: main.c: In function 'main': main.c:16:27: warning: unused variable 'nr0' [-Wunused-variable] int n,i,nr5=0,m,s=1,d,nr0=0,x,ok=1,k; ^~~ main.c:16:13: warning: unused variable 'nr5' [-Wunused-variable] int n,i,nr5=0,m,s=1,d,nr0=0,x,ok=1,k; ^~~ main.c:16:11: warning: unused variable 'i' [-Wunused-variable] int n,i,nr5=0,m,s=1,d,nr0=0,x,ok=1,k; ^ main.c:14:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("fact.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("fact.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^~~~~~~~~~~~~~