Compilare: user.cpp: In function ‘int main()’: user.cpp:15:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d ", &n); ^ user.cpp:18:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lf %lf ", &v[i].first, &v[i].second); } ^