问答题
阅读下述程序,指出宏指令ABC的功能是【 】。1 ABC MACRO X1,X2,X32 LOCAL CONT3 PUSH AX4 MOV AX, X15 SUB AX, X26 CMP AX, 07 JGE CONT8 NEG AX9 CONT: MOV X3, AX10 POP AX11 ENDM12 DATA SEGMENT13 X DW 3214 Y DW 9815 Z DW 16 DATA ENDS17 CODE SEGMENT18 ASSUME CS: CODE, DS: DTAT19 BEGIN: MOV AX, DATA20 MOV DS, AX21 ABC X, Y, Z22 MOV AH, 4CH23 INT 21H24 CODE ENDS25 END BEGIN