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Fix another error in the solution for Powers of the golden ratio - libzahl - bi… |
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git clone git://git.suckless.org/libzahl |
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--- |
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commit a5ae82e67f914d9339ac22e0c2df9fe9b79b0f57 |
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parent 89898de3bfa38d39494555a3e109253489a0e0b6 |
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Author: Mattias Andrée <[email protected]> |
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Date: Mon, 25 Jul 2016 17:03:54 +0200 |
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Fix another error in the solution for Powers of the golden ratio |
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Signed-off-by: Mattias Andrée <[email protected]> |
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Diffstat: |
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M doc/exercises.tex | 12 +++++++----- |
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1 file changed, 7 insertions(+), 5 deletions(-) |
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--- |
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diff --git a/doc/exercises.tex b/doc/exercises.tex |
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@@ -488,7 +488,7 @@ the set of pseudoprimes. |
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\item \textbf{Powers of the golden ratio} |
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This was an information gathering exercise. |
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-For $n \ge 1$, $L_n = [\varphi^n]$, where |
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+For $n \ge 2$, $L_n = [\varphi^n]$, where |
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$L_n$ is the $n^\text{th}$ Lucas number. |
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\( \displaystyle{ |
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@@ -505,12 +505,14 @@ but for efficiency and briefness, we will use |
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\vspace{-1em} |
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\begin{alltt} |
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-void golden_pow(z_t r, z_t p) |
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+void golden_pow(z_t r, z_t n) |
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\{ |
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- if (zsignum(p) <= 0) |
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- zsetu(r, zcmpi(p, -1) >= 0); |
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+ if (zsignum(n) <= 0) |
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+ zsetu(r, zcmpi(n, -1) >= 0); |
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+ else if (!zcmpu(n, 1)) |
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+ zsetu(r, 2); |
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else |
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- lucas(r, p); |
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+ lucas(r, n); |
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\} |
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\end{alltt} |
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