Compilare: main.c: In function 'main': main.c:11:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in","r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:12:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^~~~~~~~~~~~~~~ main.c:16:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^~~~~~~~~~~~~~~~~~~~~~