大家帮忙看看，这个程序的功能是什？我没看懂！ - 编程论坛

#2

zaixuexi2011-12-05 10:00

程序代码：

CODE SEGMENT
      ASSUME CS:CODE
START:
        MOV   AL,3EH       ;unsigned char num = 0x3E;
        MOV   BL,AL
        MOV   DL,AL        ;unsigned char tmp = num;
        MOV   CL,4
        SHR   DL,CL        ;tmp = (unsigned char)(tmp >> 4);
        CMP   DL,9
        JBE   NEXT1        ;if (tmp  <= 9) goto NEXT1;
        ADD   DL,7         ;else tmp += 7;
NEXT1:
        ADD   DL,30H       ;tmp += '0';
        MOV   AH,2
        INT   21H          ;putchar(tmp);
        MOV   DL,BL        ;tmp = num;
        AND   DL,0FH       ;tmp &= 0x0F;
        CMP   DL,9
        JBE   NEXT2        ;if (tmp  <= 9) goto NEXT1;
        ADD   DL,7         ;else tmp += 7;
NEXT2:
        ADD   DL,30H       ;tmp += '0';
        MOV   AH,2
        INT   21H          ;putchar(tmp);
        MOV   AH,4CH
        INT   21H          ;exit(0);
CODE  ENDS
END START

再看不懂我也没办法了，你只能自己多努力了

#3

myqyln2011-12-06 22:00

嗯嗯！我会好好看的，谢谢！

#4

yjh333x2011-12-07 20:16

是将一个2位的16进制的数的高位与低位以ASCAII码输出至屏幕