Question

我写了这个程序，它会将两个数字相加，但现在我需要让它适用于负数，任何人都有任何建议吗？

org 100
Input a /first factor
Store a /store first factor
Input b /second factor
Store b /store second factor
Load a /load first factor
Skipcond 800 /checks if number is greater than zero
Jump End /skips to the end if zero
load b /load second factor
Skipcond 800 /checks if number is greater than zero
Jump End /skips to the end if zero
Loop, Load b /reloads second factor
Subt One /subtracts one from the second factor
Store b /store the new value of the second factor
Load productAB /load the product of the two number; initially zero
Add a /add first factor to the product
Store productAB /store new value to product
Load b/ load second factor again
Skipcond 400 /end loop if b is equal to 0
Jump Loop /repeats the loop
Load productAB /load the value of productAB; no longer 0
End, output /print out results
Halt /end of program

a, Dec 0
b, Dec 0
productAB, Dec 0 /product of the first two numbers
One, Dec 1

Answer 1

使用伪代码

neg = 0
if (a < 0)
    a = -a
    neg = 1
if (b < 0)
    b = -b
    neg ^= 1
productAB = a * b
if (neg)
    productAB = -productAB

如何让这个MARIE程序用于否定？

1 个答案: