Compilare: user.cpp: In function ‘int main()’: user.cpp:38:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,sz; ^ user.cpp:39:17: warning: unused variable ‘imp’ [-Wunused-variable] double l,vi,imp; ^ user.cpp:36:34: 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:37:36: 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:44:83: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf%lf",&ve[i].a1,&ve[i].a2,&ve[i].k1,&ve[i].k2,&ve[i].vi); ^