Compilare: user.c: In function ‘main’: user.c:16:25: warning: unused variable ‘pr’ [-Wunused-variable] int n,k,prod,p2,div,pr,sum,i; ^ user.c:17:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu2.in","r",stdin); ^ user.c:18:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu2.out","w",stdout); ^ user.c:19:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^