Compilare: user.c: In function ‘main’: user.c:34:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:39:17: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c: In function ‘euler’: user.c:23:17: warning: ‘w’ may be used uninitialized in this function [-Wmaybe-uninitialized] euler (w); ^~~~~~~~~