Talk:Square root by hand: Difference between revisions
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What is the meaning of the second argument?
: The second argument is used to specify the number of decimal digits to be displayed (spit). -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 18:29, 1 August 2021 (UTC)
The REXX Version shows:
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: The REXX program was incorrectly not accounting for the displaying of the decimal point (as it was counting it as a decimal digit). The program has been corrected. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 18:22, 1 August 2021 (UTC)
: Also note that REXX program doesn't round the result (digits being displayed/spit). -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 18:29, 1 August 2021 (UTC)
:: Actually, in my opinion it should (round for the last digit) to get correct 80 digits!
<pre>
.44721359549995793928183473374625524708812367192230514485417944908210418512756097988288288167575
.44721359549995793928183473374625524708812367192230514485417944908210418512756097
</pre>
::--Walter Pachl 18:54, 1 August 2021 (UTC)
::: In order to round, the REXX program would have to compute the ''next'' decimal digit. Bear in mind that the last decimal digit has already been computed and displayed (spit) to the terminal screen, so rounding in a spigot algorithm could entail ''backing up'' and changing (undoing) the previous decimal digit that was already just displayed (spit). With irrational numbers, there is no correct last decimal digit. Spigot algorithms are not designed for rounding, but for spitting digits one at a time. Rounding can be incorporated into the routine (by withholding one decimal digit), but would unnecessary complicate any program and make the comparisons of computer programming languages more problematic. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 20:38, 1 August 2021 (UTC)
::::I see. Thanks. --Walter Pachl 06:02, 2 August 2021 (UTC)
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