Compilare: user.cpp: In function ‘int main()’: user.cpp:85:12: warning: unused variable ‘k’ [-Wunused-variable] double k,q; ^ user.cpp:85:14: warning: unused variable ‘q’ [-Wunused-variable] double k,q; ^ user.cpp:82:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:96:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%lf %lf",&v[i].x,&v[i].y); ^