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("fibo2.in","r",stdin),freopen("fibo2.out","w",stdout),scanf("%d",&n),printf("%d\n",n&1?1:0); ^ user.c:4:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("fibo2.in","r",stdin),freopen("fibo2.out","w",stdout),scanf("%d",&n),printf("%d\n",n&1?1:0); ^ user.c:4:72: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("fibo2.in","r",stdin),freopen("fibo2.out","w",stdout),scanf("%d",&n),printf("%d\n",n&1?1:0); ^