Compilare: user.c: In function ‘main’: user.c:73:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:75:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &v[i].x, &v[i].y); ^ user.c:83:35: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] aux = v[0]; v[0] = v[p]; v[p] = aux; ^