objective-c 百分比符号 (%) 在 Objective C 中的数学作用是什么？
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What does a percentage sign (%) do mathematically in Objective C?
提问by Aero Wang
I am super confused what the percentage sign does in Objective C. Can someone explain to me in language that an average idiot like myself can understand?! Thanks.
我对 Objective C 中百分比符号的作用感到非常困惑。有人可以用像我这样的普通白痴可以理解的语言向我解释吗？！谢谢。
回答by Michael Dautermann
Same as what it does in C, it's "modulo" (also known as integer remainder).
与在 C 中所做的相同，它是“模”（也称为整数余数）。
回答by Charles Martin
% is the modulo operator, so for example 10 % 3 would result in 1.
% 是模运算符，因此例如 10 % 3 将导致 1。
If you have some numbers aand b, a % bgives you just the remainder of adivided by b.
如果您有一些数字a和b，a % b则只给出a除以的余数b。
So in the example 10 % 3, 10 divided by 3 is 3 with remainder 1, so the answer is 1.
所以在这个例子中10 % 3，10 除以 3 是 3，余数是 1，所以答案是 1。
If there is no remainder to adivided by b, the answer is zero, so for example, 4 % 2 = 0.
如果a除以没有余数b，则答案为零，例如，4 % 2 = 0。
回答by Jojodmo
%is the modulo operator. It returns the remainder of <number> / <number>. For example:
%是模运算符。它返回 的余数<number> / <number>。例如：
5 % 2
means 5 / 2, which equals 2 with a remainder of 1, so, 1is the value that is returned. Here's some more examples:
mean 5 / 2，等于 2 余数为 1，因此，1是返回的值。以下是更多示例：
3 % 3 == 0 //remainder of 3/3 is 0
6 % 3 == 0 //remainder of 6/3 is 0
5 % 3 == 2 //remainder of 5/3 is 2
15 % 4 == 3 //remainder of 15/4 is 3
99 % 30 == 9 //remainder of 99/30 is 9
The definition of modulo is:
模数的定义是：
mod·u·lo
(in number theory) with respect to or using a modulus of a specified number. Two numbers are congruent modulo a given number if they give the same remainder when divided by that number.
模·u·洛
（在数论中）关于或使用指定数的模数。如果两个数字在除以该数字时得到相同的余数，则它们对给定数字取模是全等的。
