Compilare: user.cpp: In function ‘int main()’: user.cpp:50:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:55:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf%lf",&p[i].x,&p[i].y); ^ user.cpp:73:18: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] p[j].y=p[1].y; ^