Compilare: user.cpp: In function ‘int main()’: user.cpp:81:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:85:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%lf", &points[i].x, &points[i].y); ^ user.cpp:98:31: warning: ‘lowestPointIndex’ may be used uninitialized in this function [-Wmaybe-uninitialized] change(0,lowestPointIndex); ^