52 lines
1.4 KiB
HTML
52 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<link rel="stylesheet" href="" />
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<title>派生成器</title>
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</head>
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<body>
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<h1>派生成器</h1>
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<h2>作者：赵海洋</h2>
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<input type="text" id="number" placeholder="生成位数" />
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<button onclick="go()">生成派</button>
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<p>🥧 = <code id="seq" style="line-break: anywhere">3.14</code></p>
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<script>
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// 派生成器
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function* piGenerator(n = 10) {
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n = BigInt(n);
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let p, q, d, d1;
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let k = 3n,
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a = 0n,
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b = 4n,
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a1 = 40n,
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b1 = 24n;
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while (n > 0n) {
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[p, q, k] = [k * k, 2n * k + 1n, k + 1n];
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[a, b, a1, b1] = [a1, b1, p * a + q * a1, p * b + q * b1];
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d = ~~(a / b);
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d1 = ~~(a1 / b1);
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while (d === d1) {
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yield Number(d);
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a = (a % b) * 10n;
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a1 = (a1 % b1) * 10n;
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d = ~~(a / b);
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d1 = ~~(a1 / b1);
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n--;
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}
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}
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}
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function go() {
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if (number.value.match(/^\d+$/)) {
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seq.innerText = "3.3." + [...piGenerator(number.value)].join("");
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number.value = "";
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} else alert("请输入一个正整数");
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}
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</script>
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</body>
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</html>
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