Eertree: Difference between revisions
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This REXX program is modeled after the '''Ring''' example. |
This REXX program is modeled after the '''Ring''' example. |
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<lang rexx>/*REXX program creates a list of (unique) sub─palindromes that exist in an input string.*/ |
<lang rexx>/*REXX program creates a list of (unique) sub─palindromes that exist in an input string.*/ |
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parse arg x . /*obtain optional input string from CL.*/ |
parse arg x . /*obtain optional input string from CL.*/ |
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if x=='' | x=="," then x= 'eertree' /*Not specified? Then use the default.*/ |
if x=='' | x=="," then x= 'eertree' /*Not specified? Then use the default.*/ |
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@.=. /*@ tree indicates uniqueness of pals. */ |
@.=. /*@ tree indicates uniqueness of pals. */ |
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$= /*list of unsorted & unique palindromes*/ |
$= /*list of unsorted & unique palindromes*/ |
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do j=1 for L /*start at the left side of the string.*/ |
do j=1 for L /*start at the left side of the string.*/ |
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do k=1 for L /*traverse from left to right of string*/ |
do k=1 for L /*traverse from left to right of string*/ |
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parse var x =(j) y +(k) /*extract a substring from the string. */ |
parse var x =(j) y +(k) /*extract a substring from the string. */ |
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$=$' ' y /*append the sub─palindrome to the list*/ |
$=$' ' y /*append the sub─palindrome to the list*/ |
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end /*k*/ /* [↑] an extra blank is inserted. */ |
end /*k*/ /* [↑] an extra blank is inserted. */ |
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end /*j*/ |
end /*j*/ |
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#=words($) /*get the number of palindromes found. */ |
#=words($) /*get the number of palindromes found. */ |
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subP= 'sub─palindromes' /*a literal to make SAY texts shorter. */ |
subP= 'sub─palindromes' /*a literal to make SAY texts shorter. */ |
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say pad 'The number of' subP "found: " # |
say pad 'The number of' subP "found: " # |
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say |
say |
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say pad 'The list of' subP "found: " |
say pad 'The list of' subP "found: " /*display the list of the palindromes. */ |
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say strip($) /* |
say strip($) /*stick a fork in it, we're all done. */</lang> |
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/*stick a fork in it, we're all done. */</lang> |
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{{out|output|text= when using the default input:}} |
{{out|output|text= when using the default input:}} |
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<pre> |
<pre> |
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