Question

所以我试图制作一个Brainfuck解释器，但是在我用来执行Brainfuck循环的while循环中，即使只有一个条件成立，它也会爆发。

示例：

+++[>+<-]

应该导致：

[0, 3]

但是，当循环从[开始时，它将创建一个新单元格，因此结构从[3]变为[3, 0]。因此，当前工作单元格为0并且循环正在中断。但是，我只有在0且当前字符为]时才会中断。

cells = [0] # Array of data cells in use
brainfuck = str(input("Input Brainfuck Code: ")) # Brainfuck code
workingCell = 0 # Data pointer position
count = 0 # Current position in code
def commands(command):
    global cells
    global workingCell
    if command == ">":
        workingCell += 1
        if workingCell > len(cells) - 1:
            cells.append(0)
    elif command == "<":
        workingCell -= 1
    elif command == "+":
        cells[workingCell] += 1
    elif command == "-":
        cells[workingCell] -= 1
    elif command == ".":
        print(chr(cells[workingCell]))
    elif command == ",":
        cells[workingCell] = int(input("Input: "))
def looper(count):
    global cells
    global workingCell
    print("START LOOP", count)
    count += 1
    looper = loopStart = count
    while brainfuck[looper] != "]" and cells[workingCell] != 0: # This line is causing trouble
        if brainfuck[looper] == "]":
            looper = loopStart
        commands(brainfuck[looper])
        count += 1
        looper += 1
    return count
while count < len(brainfuck):
    if brainfuck[count] == "[":
        count = looper(count)
        print("END LOOP", count)
    else:
        commands(brainfuck[count])
    count += 1

提前谢谢。

Answer 1

我只有在0且当前字符为]

时才会中断

如果这就是您想要的，那么您while的逻辑错误。它应该是：

while not (brainfuck[looper] == "]" and cells[workingCell] == 0):

根据deMorgan's Laws，当您在not之间分发and时，您会反转每个条件并将and更改为or，因此它应该是：

while brainfuck[looper] != "]" or cells[workingCell] != 0:

如果这令人困惑，你可以写下：

while True:
    if brainfuck[looper] == "]" and cells[workingCell] == 0:
        break

这反映了你在描述中所说的内容。

尽管2个变量中只有1个为真，但循环停止

1 个答案: