Compilare: user.c: In function ‘f’: user.c:18:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i>1 && v[i]>0) ^ user.c: In function ‘main’: user.c:42:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre.in","r",stdin); ^ user.c:43:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre.out","w",stdout); ^ user.c:44:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&a,&b,&c,&kc); ^