Sorting algorithms/Heapsort: Difference between revisions
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=={{header|REXX}}== |
=={{header|REXX}}== |
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<lang rexx>/*REXX program sorts an array using the heapsort method. */ |
<lang rexx>/*REXX program sorts an array using the heapsort method. */ |
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call gen@ /*generate array elements. */ |
call gen@ /*generate array elements. */ |
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call show@ 'before sort' /*show before array elements*/ |
call show@ 'before sort' /*show before array elements*/ |
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call show@ ' after sort' /*show after array elements*/ |
call show@ ' after sort' /*show after array elements*/ |
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exit |
exit |
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/*─────────────────────────────────────HEAPSORT subroutine─────────*/ |
/*─────────────────────────────────────HEAPSORT subroutine─────────*/ |
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heapSort: procedure expose @.; parse arg n |
heapSort: procedure expose @.; parse arg n |
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return |
return |
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/*─────────────────────────────────────SHUFFLE subroutine──────────*/ |
/*─────────────────────────────────────SHUFFLE subroutine──────────*/ |
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shuffle: procedure expose @.; parse arg i,n; _=@.i |
shuffle: procedure expose @.; parse arg i,n; _=@.i |
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@.i=_ |
@.i=_ |
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return |
return |
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/*─────────────────────────────────────GEN@ subroutine─────────────*/ |
/*─────────────────────────────────────GEN@ subroutine─────────────*/ |
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gen@: @.='' /*assign default value. */ |
gen@: @.='' /*assign default value. */ |
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@.1 ='---letters of the modern Greek Alphabet---' |
@.1 ='---letters of the modern Greek Alphabet---' |
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@.2 ='==========================================' |
@.2 ='==========================================' |
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highItem=highItem-1 /*adjust highItem slightly. */ |
highItem=highItem-1 /*adjust highItem slightly. */ |
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return |
return |
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/*─────────────────────────────────────SHOW@ subroutine────────────*/ |
/*─────────────────────────────────────SHOW@ subroutine────────────*/ |
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show@: widthH=length(highItem) /*maximum width of any line.*/ |
show@: widthH=length(highItem) /*maximum width of any line.*/ |
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end |
end |
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say copies('─',80) /*show a |
say copies('─',80) /*show a separator line. */ |
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return</lang> |
return</lang> |
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{{out}} |
{{out}} |
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