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< > BotCompany Repo | #1030361 // collatzSequence - Collatz sequence for a number (as iterator). returns final 1 and initial number

JavaX fragment (include) [tags: use-pretranspiled]

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static ItIt<BigInt> collatzSequence(long n) {
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  ret collatzSequence(bigInt(n));
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}
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static ItIt<BigInt> collatzSequence(BigInt _n) {
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  ret new ItIt<BigInt> {
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    BigInt three = bigInt(3);
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    BigInt n;
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    public bool hasNext() {
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      ret neq(n, BigInt.ONE);
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    }
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    public BigInt next() {
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      if (n == null) ret n = _n; // first number
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      if (even(n.intValue()))
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        n = div(n, BigInt.TWO);
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      else
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        n = plus(mul(n, three), BigInt.ONE);
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      ret n;
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    }
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  };
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}

Author comment

Began life as a copy of #1030359

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Travelled to 4 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, vouqrxazstgt

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Snippet ID: #1030361
Snippet name: collatzSequence - Collatz sequence for a number (as iterator). returns final 1 and initial number
Eternal ID of this version: #1030361/4
Text MD5: 1e7e86c1ee37560ee7ca9cca99940d32
Transpilation MD5: 1e3078bfd9392994c31d0155bdb21f96
Author: stefan
Category: javax / maths
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2020-12-09 15:12:00
Source code size: 516 bytes / 23 lines
Pitched / IR pitched: No / No
Views / Downloads: 197 / 277
Version history: 3 change(s)
Referenced in: [show references]