1
我想寫一個LC3彙編語言程序,需要兩個輸入數字並打印出x * y = z
。LC3彙編語言
我可以讓它工作的號碼0-9
然而任何數字上面,我得到奇怪的字母或符號。
另外我怎樣才能使它不僅可以只採取每個GETC
1個輸入,但兩個數字,例如。 10 * 12= 120
? 任何幫助,將不勝感激! :)
這是我迄今所做
.ORIG x3000
AND R3, R3, #0 ;r3 stores the sum, set r3 to zero
AND R4, R4, #0 ;r4 is the counter
LD R5, INVERSE_ASCII_OFFSET ;inverse ascii offset
LD R6, DECIMAL_OFFSET ;decimal offset
;---------------------
;storing first input digits
LEA R0, display1 ;load the address of the 'display1' message string
PUTS ;Prints the message string
GETC ;get the first number
OUT ;print the first number
ADD R1, R0, #0 ;store input value(ascii) to r1
ADD R1, R1, R5 ;get real value of r1
;storing second input digits
LEA R0, display2 ;load the address of the 'display2' message string
PUTS ;Prints the message string
GETC ;get the first number
OUT ;print the first number
ADD R2, R0, #0 ;store input value(ascii) to r2
ADD R2, R2, R5 ;get real value of r2
;----------------------
ADD R4, R2, #0 ;fill counter with multiplier
MULTIPLICATION:
ADD R3, R3, R1 ;add to sum
ADD R4, R4, #-1 ;decrease counter by one
BRp MULTIPLICATION ;continue loop until multiplier is 0
LEA R0, stringResult
PUTS
ADD R0, R3, R6 ;move result to r0
OUT ;print result
HALT
display1 .STRINGZ "\nenter the 1st no.: "
display2 .STRINGZ "\nenter the 2nd no.: "
stringResult .STRINGZ "\nResult: "
INVERSE_ASCII_OFFSET .fill xFFD0 ; Negative of x0030.
DECIMAL_OFFSET .fill #48
.END
你可以看看這個嗎? http://superuser.com/questions/904324/which-of-the-following-instructions-can-reference-a-memory-location-that-is-100 – committedandroider