汇编经典小程序(共5页).doc

实验一：判断一个数X的正，负数，还是零。（假设是正数，输出+，是负数，输出-，是零，输出This is a zore !）DATA SEGMENTX DB 10CR EQU 0DHLF EQU 0AHW DB This is a zore!,CR,LF,$ZHENG DB +,CR,LF,$FU DB -,CR,LF,$DATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATASTART:MOV AX,DATA MOV DS,AX MOV AL,X AND AL,AL JZ L1 SHL AL,1 JC L3 JMP L2L1: MOV DX,OFFSET W MOV AH,9 INT 21H JMP L4L2: MOV DX,OFFSET ZHENG MOV AH,9 INT 21H JMP L4L3: MOV DX,OFFSET FU