Compilare: main.c: In function 'main': main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("iunie.in","r",stdin),freopen("iunie.out","w",stdout),scanf("%d",&n),printf("%d",n%2?0:n/4); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("iunie.in","r",stdin),freopen("iunie.out","w",stdout),scanf("%d",&n),printf("%d",n%2?0:n/4); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("iunie.in","r",stdin),freopen("iunie.out","w",stdout),scanf("%d",&n),printf("%d",n%2?0:n/4); ^~~~~~~~~~~~~~