检查数字是偶数还是奇数 [英] Check whether number is even or odd

问题描述

我如何确定给定的数字是偶数还是奇数?我一直想弄明白这个问题很久了，但一直没有结果.

How would I determine whether a given number is even or odd? I've been wanting to figure this out for a long time now and haven't gotten anywhere.

推荐答案

您可以使用模数运算符，但这会很慢.如果它是一个整数，你可以这样做:

You can use the modulus operator, but that can be slow. If it's an integer, you can do:

if ( (x & 1) == 0 ) { even... } else { odd... }

这是因为低位总是设置为奇数.

This is because the low bit will always be set on an odd number.

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