OAM汇编语言澄清

时间:2013-03-30 01:24:15

标签: loops assembly oam

我在编写一个OAM程序时遇到问题,该程序生成一系列奇数,并以1开头交替显示。

我已经编写了一个程序,但它不起作用,我不知道为什么。因为这是一种罕见的语言,如果有人可以帮助和解释我做错了什么会很好。

X,NOOP
Y,NOOP 
LDA stdin
loop, SET 1
LDA Y
STA 0
LDA X
DEC
STA X #X = X - 1
LDA X #ACC = X

1 个答案:

答案 0 :(得分:0)

请注意其他读者想知道这是怎么回事:
一个名为One Address Machine的基于web OAMulator is here编译器/汇编器/模拟器。

您要求OAM program that generates a sequence of odd numbers with alternating signs starting with 1(未指定最大值) 我将解释您需要以下输出:1, -3, 5, -7, 9, -11, 13, -15 etc...

我认为您的LDA stdin是要求最大值,但您似乎不会将其与STA一起存储。在初始化变量BRx后,您也没有开始将“y”分支到“程序块”。我也没有真正看到你的代码如何替换标志......

我首先写了OAMPL代码:

n = 1                       #Init number n as 1
PRINT "enter max number:"   #Ask for max number
READ i                      #Read that number from input, storing it as i
LOOP (/ i 2)                #Calculate number of iterations, passing that to LOOP
  IF t                      #If t (toggle)
    t = 0                   #Toggle falsy
    PRINT (- 0 n)           #Print 0-counter
  ELSE
    t = 1                   #Toggle truthy
    PRINT n                 #Print counter
  ENDIF
  n = (+ n 2)               #Increase counter by 2
END
EXIT                        #Exit program

将编译为以下OAM Assembly

# Emitted by the OAMPL compiler
1.  BR  5   # branch to program block
# Variable storage allocation block
2. n,   NOOP    # variable n
3. i,   NOOP    # variable i
4. t,   NOOP    # variable t
# Begin OAM program block
# OAMPL: n = 1
5.  SET 1
6.  STA n
# OAMPL: PRINT "enter max number:"
7.  SET "enter max number:"
8.  STA stdout
# OAMPL: READ i
9.  LDA stdin
10. STA i
# OAMPL: LOOP (/ i 2)
11. SET 2
12. STA 14
13. BR 15
14. NOOP    # intermediate value
15. LDA i
16. DIV 14
17. BR L18
18. NOOP    # loop counter
# OAMPL: IF t
19. LDA t
20. BRZ I20
# OAMPL: t = 0
21. SET 0
22. STA t
# OAMPL: PRINT (- 0 n)
23. LDA n
24. STA 26
25. BR 27
26. NOOP    # intermediate value
27. SET 0
28. SUB 26
29. STA stdout
# OAMPL: ELSE
30. BR I30
31. I20,    NOOP
# OAMPL: t = 1
32. SET 1
33. STA t
# OAMPL: PRINT n
34. LDA n
35. STA stdout
# OAMPL: ENDIF
36. I30,    NOOP
# OAMPL: n = (+ n 2)
37. SET 2
38. STA 40
39. BR 41
40. NOOP    # intermediate value
41. LDA n
42. ADD 40
43. STA n
# OAMPL: END
44. LDA 18
45. DEC
46. L18,    STA 18
47. BRP 19
# OAMPL: EXIT
48. HLT

注意:您也可以省略评论(# comment)和排行(行号)编号。

如果我在50字段中输入input(以回答最大值问题)并点击execute(编译后!),我会得到以下output结果:

enter max number:
1
-3
5
-7
9
-11
13
-15
17
-19
21
-23
25
-27
29

希望这有帮助!