Rare numbers: Difference between revisions
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Langurmonkey (talk | contribs) |
Langurmonkey (talk | contribs) |
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=== not optimized === |
=== not optimized === |
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It could look something like the following (ignoring whatever optimizations the other examples are using), if it was fast enough. I did not have the time/processor to test finding the first 5. The |
It could look something like the following (ignoring whatever optimizations the other examples are using), if it was fast enough. I did not have the time/processor to test finding the first 5. The israre() function appears to return the right answer, tested with individual numbers. |
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<syntaxhighlight lang="langur"> |
<syntaxhighlight lang="langur"> |
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val perfectsquare = fn n: (n ^/ 2) div 1 |
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val |
val israre = fn(n) { |
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val |
val r = reverse(n) |
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if |
if n == r: return false |
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val |
val sum = n + r |
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val |
val diff = n - r |
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diff > 0 and perfectsquare(sum) and perfectsquare(diff) |
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} |
} |
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val |
val findfirst = fn(mx) { |
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for[=[]] |
for[=[]] i = 0; len(_for) < mx; i += 1 { |
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if |
if israre(i) { |
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_for ~= [ |
_for ~= [i] |
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} |
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} |
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} |
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val findandprint = impure fn(mx) { |
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for[cnt=0] i = 0; cnt < mx ; i += 1 { |
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if israre(i) { |
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writeln "\n rare ", i, " " |
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cnt += 1 |
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} |
} |
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} |
} |
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# if you have the time... |
# if you have the time... |
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writeln "the first 5 rare numbers: ", |
writeln "the first 5 rare numbers: ", findfirst(5) |
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</syntaxhighlight> |
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=={{header|Lua}}== |
=={{header|Lua}}== |
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