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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Hailstone-sequence/PlainTeX/hailstone-sequence.tex Normal file
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\newif\ifprint
\newcount\itercount
\newcount\currentnum
\def\hailstone#1{\itercount=0 \currentnum=#1 \hailstoneaux}
\def\hailstoneaux{%
\advance\itercount1
\ifprint\number\currentnum\space\space\fi
\ifnum\currentnum>1
\ifodd\currentnum
\multiply\currentnum3 \advance\currentnum1
\else
\divide\currentnum2
\fi
\expandafter\hailstoneaux
\fi
}
\parindent=0pt
\printtrue\hailstone{27}
Length = \number\itercount
\bigbreak
\newcount\ii \ii=1
\printfalse
\def\lenmax{0}
\def\seed{0}
\loop
\ifnum\ii<100000
\hailstone\ii
\ifnum\itercount>\lenmax\relax
\edef\lenmax{\number\itercount}%
\edef\seed{\number\ii}%
\fi
\advance\ii1
\repeat
Seed max = \seed, length = \lenmax
\bye