Compilare: user.c: In function ‘main’: user.c:173:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:175:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%lf", &a[i].x, &a[i].y); ^ user.c:177:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &m); ^ user.c:179:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lf%lf", &b[i].x, &b[i].y); ^ user.c:193:7: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] aux = v[p]; v[p] = v[0]; v[0] = aux; ^