程序段如下 上述程序运行后,试回答: (1)当(AL)=()时,程序转向BRCH1 (2)当(AL)=()时,程序转向BRCH2 (3)当(AL)=()时,程序转向BRCH3
①(AL)=0, ②(AL)=1, ③(AL)=-1