Write a function (or equivalent subprogram) to accept a single integer valued argument and return a (similarly typed) value found by reversing the order of the base-10 digits of the argument.
For example given 76543 return 34567
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6\$\begingroup\$ Go back to the time the number was a string, then reverse the string \$\endgroup\$– pmgCommented Jun 11, 2011 at 10:54
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2\$\begingroup\$ The idea of a "shortest algorithm" is somewhat specious, especially if you'll allow "any language." Think up an algorithm, and I'll give you a DSL with an appropriate "~" operator ... \$\endgroup\$– PointyCommented Jun 11, 2011 at 10:56
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3\$\begingroup\$ Just a notice: any number ending with 0 becomes a shorter number of digits when reversed... \$\endgroup\$– powtacCommented Jun 11, 2011 at 12:44
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46\$\begingroup\$ I know an algorithm that takes no time at all, but only works on palindromic numbers ;) \$\endgroup\$– schnaaderCommented Jun 11, 2011 at 14:47
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\$\begingroup\$ Found time to do the re-write myself. I hope this remain the puzzle that eltond meant to pose. \$\endgroup\$– dmckee --- ex-moderator kittenCommented Jun 12, 2011 at 0:37
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67 Answers
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Python 2, 26 bytes
print int(`input()`[::-1])
answered Jun 3, 2016 at 13:58
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Python 3, 33 bytes
I decided to make a function instead of hardcoding it.
def r(n):print(int(str(n)[::-1]))
The code is pretty self-explanatory.
Usage: r(12345)
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Oracle SQL 11.2,
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Oracle SQL 11.2, 35 34 bytes
SELECT 0+REVERSE(:1||'')FROM DUAL;
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Python
def ans(n):
L = str(n)
return(int(L[::-1]))
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JavaScript (ES6) 35
a=b=>b.split("").reverse().join("")
answered Feb 27, 2014 at 5:57
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1\$\begingroup\$ This doesn't assume
bis an integer. \$\endgroup\$ Commented Jul 4, 2015 at 18:54