Eroare de compilare: user.c: In function ‘main’: user.c:20:22: error: ‘M_PI’ undeclared (first use in this function) g+=2*M_PI; ^ user.c:20:22: note: each undeclared identifier is reported only once for each function it appears in user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in","r",stdin),freopen("infasuratoare.out","w",stdout),scanf("%d",&n),x[0]=y[0]=1000000000; ^ user.c:6:50: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in","r",stdin),freopen("infasuratoare.out","w",stdout),scanf("%d",&n),x[0]=y[0]=1000000000; ^ user.c:6:88: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in","r",stdin),freopen("infasuratoare.out","w",stdout),scanf("%d",&n),x[0]=y[0]=1000000000; ^ user.c:8:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf",&x[i],&y[i]); ^