perplexus.info :: Algorithms : Single Line Expression

Single Line Expression (Posted on 2008-01-27)

Give a single line "C type" expression to evaluate (-1)^k using only +,-,* and % operators.

See The Solution Submitted by Praneeth

Rating: 5.0000 (1 votes)

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Puzzle Solution

Comment 6 of 6 |

Assuming that k is an integer, the required expression is:

(-1)^k = 1 - 2*(k%2)

Note: In advanced arithmetic, the above expression translates to,:

(-1)^k = 1 -2*{k (mod 2)}

Posted by K Sengupta on 2022-09-12 01:09:42

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