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Floyd's triangle: Difference between revisions

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Floyd's triangle (view source)

Revision as of 17:17, 8 October 2018

154 bytes added ,  5 years ago
m
→‎version 2, simple formula: added whitespace and comments.
(→‎{{header|Python}}: Defining just the relationship between successive terms)
m (→‎version 2, simple formula: added whitespace and comments.)
Line 3,695:
This REXX version uses a simple formula to calculate the maximum value (triangle element) displayed.
<lang rexx>/*REXX program constructs & displays Floyd's triangle for any number of specified rows.*/
parse arg N .; if N=='' | N=="," then N=5 5 /*Not specified? Then use the default.*/
mx= N * (N+1) % 2 - N /*calculate the maximum value of any value. */
say 'displaying a ' N " row Floyd's triangle:" /*show the header for Floyd's triangle.*/
say /*display a blank line below the title.*/
say
#=1; do r=1 for N; i= 0; _= /*construct Floyd's triangle row by row*/
do #=# for r; i= i +1 1 /*start to construct a row of triangle.*/
_= _ right(#, length( mx+i ) ) /*build a row of the Floyd's triangle. */
end /*#*/ /*calculate the max length on the fly. */
say substr(_, 2) /*remove 1st leading blank in the line.*/
end /*r*/ /*stick a fork in it, we're all done. */</lang>
{{out|output|text=&nbsp; when using the default input:}}
<pre>
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