Compilare: user.c: In function ‘main’: user.c:75:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:77:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^ user.c: In function ‘calc’: user.c:26:11: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] prev[a] = last; ^