我的程序，以簡化分數被打調用堆棧限制。爲什麼？

Question

我試圖做的，方便日常程序員在Reddit上的node.js中鏈接：https://www.reddit.com/r/dailyprogrammer/comments/4uhqdb/20160725_challenge_277_easy_simplifying_fractions/

我寫了一個快速程序，但它給輸出有點不同，上破高的。

我的代碼：

const readline = require("readline"); 
const rl = readline.createInterface({ 
    input: process.stdin, 
    output: process.stdout 
}); 

function gcd(a, b) { 
    if (b == 0) { 
    return a; 
    } 

    return gcd(b, a & b); 
} 

function all() { 
    rl.question("wewe? ", (answer) => { 
    if (answer === "x") { 
     rl.close(); 
     return; 
    } 
    var str = answer.split(" "); 
    var num = +str[0]; 
    var den = +str[1]; 
    var div = gcd(num, den); 
    console.log(num/div + " " + den/div); 
    all(); 
    }); 
} 

all(); 

這是電流輸出：

aria@aria-ubuntu /development/randomcode/dailyprogramming$ node Simplifying\ fractions.js 
wewe? 4 8 
0.5 1 
wewe? 1536 78360 
readline.js:924 
      throw err; 
      ^

RangeError: Maximum call stack size exceeded 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:7:13) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 
    at gcd (/development/randomcode/dailyprogramming/Simplifying fractions.js:12:10) 

預期輸出：

1 2 
64 3265 

Answer 1

這是一個簡單的輸入錯誤！該死的我的新鍵盤。我無法相信我做到了。

我用4 & 8時，它應該是4％，8