Compilare: user.c: In function ‘main’: user.c:24:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:26:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^ user.c:50:14: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d", last + 1); ^ user.c:47:17: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!e && nr == 1) ^