文档介绍：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 SEGMENT
X DB 10
CR EQU 0DH
LF EQU 0AH
W DB 'This is a zore!',CR,LF,'$'
ZHENG DB '+',CR,LF,'$'
FU DB '-',CR,LF,'$'
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA
MOV DS,AX
MOV AL,X
AND AL,AL
JZ L1
SHL AL,1
JC L3
JMP L2
L1: MOV DX,OFFSET W
MOV AH,9
INT 21H
JMP L4
L2: MOV DX,OFFSET ZHENG
MOV AH,9
INT 21H
JMP L4
L3: MOV DX,OFFSET FU
MOV AH,9
INT 21H
JMP L4
L4: MOV AH,4CH
INT 21H
CODE ENDS
END START
实验二:求十个数中的最小数,并以十进制输出。(若要求最大的,只要把JC 改为JNC 即可)(仅局限于0---16间的数比较,因为ADD AL,30H只是针对一位的十六进制转换十进制的算法)
DATA SEGMENT
XDAT DB 0AH,1FH,02H,03H,04H,05H,06H,07H,08H,09H
MIN DB ?
CR EQU 0DH
LF EQU 0AH
W DB ' is min',CR,LF,'$'
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA
MOV DS,AX
MOV CX,9
MOV SI,OFFSET XDAT
MOV AL,[SI]
L2: CMP AL,[SI+1]
JC L1
MOV AL,[SI+1]
L1: INC SI
LOOP L2
ADD AL,30H
MOV DL,AL
MOV AH,2
INT 21H
MOV DX,OFFSET W
MOV AH,9
INT 21H
CODE ENDS
END START
实验三:设有3个单字节无符号数存放在BUF开始的缓冲区中,编写一个能将它们从大到小从新排列的程序。
DATA SEGMENT
BUF DB 87,234,123
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA
MOV DS,AX
MOV SI,OFFSET BUF
MOV AL,[SI] ;把3个数取到寄存器中
MOV BL,[SI+1]
MOV CL,[SI+2]
CMP AL,BL ;排序,将最大数送AL寄存器
JAE NEXT1
XCHG AL,BL
NEXT1:CMP AL,CL
JAE NEXT2
XCHG AL,CL
NEXT2