Compilare: user.c: In function ‘main’: user.c:4:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("kprime.in","r",stdin),freopen("kprime.out","w",stdout),scanf("%d%d",&n,&k),x[2]=1; ^ user.c:4:43: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("kprime.in","r",stdin),freopen("kprime.out","w",stdout),scanf("%d%d",&n,&k),x[2]=1; ^ user.c:4:74: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("kprime.in","r",stdin),freopen("kprime.out","w",stdout),scanf("%d%d",&n,&k),x[2]=1; ^ user.c:13:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v); ^