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我目前正在制作一个brainf * ck并遇到了循环问题。Brainf * ck解释器循环问题
我遵循this的一些建议,但我似乎无法得到它的工作。
这是到目前为止我的代码:
<html>
<body>
<font face="consolas">
<script>
var brPos = 0;
var k = 0;
var loop = [];
var printtape = "";
var out = "";
var i = 0;
var pointer = 0;
var tape = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
var source = prompt("Code").split("");
while (i<source.length+1){
if (source[i] == "<"){
pointer--;
} else if (source[i] == ">"){
pointer++;
} else if (source[i] == "+"){
tape[pointer]++;
} else if (source[i] == "-"){
tape[pointer]--;
} else if (source[i] == ","){
tape[pointer] = prompt("Input").charCodeAt(0);
} else if (source[i] == "."){
out += String.fromCharCode(tape[pointer]);
} else if (source[i] == "["){
loop.push(pointer);
if (tape[pointer] == 0){
brPos = i;
while (k >= 0) {
if (source[brPos] == "[") {
k++;
} else if (source[brPos] == "]") {
k--;
}
}
i = brPos;
brPos = 0;
loop.pop();
}
} else if (source[i] == "]"){
i=loop[loop.length-1];
}
i++;
for (j=0;j<tape.length;j++) {
if (tape[j] > 255) {
tape[j] = 0;
} else if (tape[j] < 0) {
tape[j] = 255;
}
}
console.log(tape);
console.log(loop);
}
printtape = "";
printtape += "|";
for (i=0;i<tape.length;i++) {
if (tape[i]<10) {
printtape += "00"+tape[i]+"|";
}
if (tape[i]>=10&&tape[i]<100) {
printtape += "0"+tape[i]+"|";
}
if (tape[i]>=100) {
printtape += tape[i]+"|";
}
}
printtape += "<br>";
printtape += " ";
for (i=0;i<pointer;i++) {
printtape += " ";
}
printtape += "^";
document.write(printtape);
alert(out);
</script>
</font>
</body>
</html>
这是有问题的代码(我认为):
} else if (source[i] == "["){
loop.push(pointer);
if (tape[pointer] == 0){
brPos = i;
while (k >= 0) {
if (source[brPos] == "[") {
k++;
} else if (source[brPos] == "]") {
k--;
}
}
i = brPos;
brPos = 0;
loop.pop();
}
} else if (source[i] == "]"){
i=loop[loop.length-1];
}
当我与一个brainf * CK循环运行的代码(IE)在它,它不结束while循环,并最终崩溃,我不知道为什么。
P.S.我知道在评论中有人会说<font>
标记是无效的HTML,我应该使用CSS,但它的工作原理,它比CSS快,我真的不在乎。
问题是什么(除了不工作)? –
它永远运行,似乎并没有结束while循环。 – FinW