编程中模数(％)的实际用途是什么? [英] What are the practical uses of modulus (%) in programming?

问题描述

可能重复:
识别何时使用mod运算符

Possible Duplicate:
Recognizing when to use the mod operator

模数的实际用途是什么?我知道什么是模除法.我想到的第一种情况是使用它来查找奇数和偶数以及时钟算术.但是我还能在其他地方使用它吗?

What are the practical uses of modulus? I know what modulo division is. The first scenario which comes to my mind is to use it to find odd and even numbers, and clock arithmetic. But where else I could use it?

推荐答案

我发现最常见的用途是包装"您的数组索引.

The most common use I've found is for "wrapping round" your array indices.

例如，如果您只想重复循环遍历一个数组，则可以使用:

For example, if you just want to cycle through an array repeatedly, you could use:

int a[10];
for (int i = 0; true; i = (i + 1) % 10)
{
  // ... use a[i] ...
}

取模确保i保持在[0，10)范围内.

The modulo ensures that i stays in the [0, 10) range.

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