Compilare: user.cpp: In function ‘int main()’: user.cpp:27:27: warning: null argument where non-null required (argument 1) [-Wnonnull] if (total==0) { puts(0); continue; } ^ user.cpp:22:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cpal.in","r",stdin); ^ user.cpp:23:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cpal.out","w",stdout); ^ user.cpp:26:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int j=1;j<=9;j++) scanf("%d",&fr[j]),total+=fr[j]; ^