Compilare: user.cpp: In function ‘int main()’: user.cpp:15:29: warning: format ‘%lu’ expects argument of type ‘long unsigned int*’, but argument 3 has type ‘long long int*’ [-Wformat=] fscanf(f,"%lu",&a[i]); ^ user.cpp:13:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lu",&a[i]); ^