Compilare: main.c: In function 'main': main.c:32:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(R(p[i],r[i],p[j],r[j])&&V(p[i],r[i],p[j],r[j])) ^ main.c:27:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin),freopen("geometry.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:38: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin),freopen("geometry.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:73: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin),freopen("geometry.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~ main.c:29:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf",&p[i].x,&p[i].y,&r[i].x,&r[i].y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~