Compilare: user.cpp: In function ‘int main()’: user.cpp:36:16: warning: unused variable ‘y’ [-Wunused-variable] double y=(l-spk-spq)/(spa+spb); ^ user.cpp:15:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("xmoto.in", "r",stdin); ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.out", "w",stdout); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lf", &n, &l); ^ user.cpp:21:82: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf%d", &tr[i].a, &tr[i].b, &tr[i].k, &tr[i].q, &tr[i].v); ^