Compilare: main.c: In function 'main': main.c:15:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in","r",stdin),freopen("euclid3.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:34: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in","r",stdin),freopen("euclid3.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:68: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in","r",stdin),freopen("euclid3.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~ main.c:17:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&c),d=G(a,b,&x,&y); ^~~~~~~~~~~~~~~~~~~~~~~~