Compilare: user.cpp: In function ‘void intersect(double, double, double, double, double, double, double&, double&, double&, double&)’: user.cpp:46:11: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] double a,b,h; ^ user.cpp: In function ‘int main()’: user.cpp:114:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:116:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf %lf %lf",&X[i],&Y[i],&R[i]); ^