Compilare: user.cpp: In function ‘int main()’: user.cpp:20:9: warning: unused variable ‘j’ [-Wunused-variable] int j=0; ^ user.cpp:21:10: warning: unused variable ‘f’ [-Wunused-variable] bool f=true; ^ user.cpp:22:12: warning: unused variable ‘nr’ [-Wunused-variable] double nr; ^ user.cpp:23:9: warning: unused variable ‘x’ [-Wunused-variable] int x=0; ^ user.cpp:13:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dstar.in","r",stdin); ^ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dstar.out","w",stdout); ^ user.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:41:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf",&v[i]); ^