Compilare: user.cpp: In function ‘int main()’: user.cpp:27:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ user.cpp:30:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lf%lf%d%lf%lf", &dx, &dy, &k, &cx, &cy); ^ user.cpp: In function ‘long long int f(long long int, int&, double, double, double, double)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^