Compilare: user.cpp: In function ‘int swap(Point&, Point&)’: user.cpp:25:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:79:16: warning: variable ‘fout’ set but not used [-Wunused-but-set-variable] FILE *fin,*fout; ^ user.cpp:83:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:85:70: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=0;i<n;i++) fscanf(fin,"%f%f",&points[i].x,&points[i].y); ^