How do I check if a float number is even or odd

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C

How do I check if a float number is even or odd

for example 2.2 is even and 4.3 is odd

Posted 31-Dec-13 12:42pm

NorouziFar

Updated 4-Feb-17 15:52pm

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ridoy 1-Jan-14 1:29am

certainly 2.2 is not an even nor 4.3 is an odd!

3 solutions

Solution 1

You could do something like this:

C

isEven = (num * 10) % 2 == 0;

That only works if you only care about the first digit, depends on how many decimal places you want to go out to.

Posted 31-Dec-13 13:09pm

Ron Beyer

Updated 31-Dec-13 19:19pm

v3

Solution 3

I agree with the others, only an integer can be "even" or "odd". As far as programming goes, I agree that an even number is [n MOD 2 = 0] or [n % 2 == 0]. But if I were trying to identify the furthest-right digit as "even" or "odd", I'd prolly use a substring to single out that digit, convert to integer, then check it as [digit Mod 2]. Maybe don't listen to me, though, I only just started my second semester programming...

Posted 4-Feb-17 15:52pm

Member 12983160

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Richard MacCutchan 5-Feb-17 3:06am

Three years too late.

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PIEBALDconsult · Accepted Answer · 2013-12-31T13:39:00

"odd and even only applies to integers"

"Only integers are even or odd. We do not call fractions, irrational numbers, imaginary numbers, and so on either even or odd"

Any value that is not an even integer is odd.

2.2 is not even -- "An even number is an integer of the form n=2k, where k is an integer."

"An even number is an integer which is "evenly divisible" by two. This means that if the integer is divided by 2, it yields no remainder."

Convert to an integer (by multiplying by a power of ten) and try it, the answer may be wrong, but it depends on what you want to do with them.