Compilare: main.c: In function 'main': main.c:13:79: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'char *' [-Wformat=] freopen("euclid3.in","r",stdin),freopen("euclid3.out","w",stdout),scanf("%d",&t); ^ main.c:16:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(d=a,e=b;r=d%e;d=e,e=r); ^~~ main.c:13:5: 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:13:37: 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:13:71: 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:15:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&c);//,d=E(a,b); ^~~~~~~~~~~~~~~~~~~~~~~~