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("patrat.in","r",stdin),freopen("patrat.out","w",stdout),scanf("%d%d",&x,&y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("patrat.in","r",stdin),freopen("patrat.out","w",stdout),scanf("%d%d",&x,&y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:69: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("patrat.in","r",stdin),freopen("patrat.out","w",stdout),scanf("%d%d",&x,&y); ^~~~~~~~~~~~~~~~~~~