如何在C#中计算整数的除法和模数?
发布于 2013-06-28 00:40:17
quotient = Math.DivRem(dividend, divisor, out remainder);
发布于 2013-01-03 14:11:26
有趣的事实!
“模数”运算定义为:
a % n ==> a - (a/n) * n
因此,您可以使用自己的运算符,尽管它会比内置的%运算符慢得多:
public static int Mod(int a, int n)
{
return a - (int)((double)a / n) * n;
}
编辑:哇,最初在这里说错了话,谢谢@joren抓住我
现在我在这里依赖于这样一个事实,C#中的除法+ cast- to -int等同于Math.Floor
(即,它去掉了小数),但一个“真正”的实现应该是这样的:
public static int Mod(int a, int n)
{
return a - (int)Math.Floor((double)a / n) * n;
}
实际上,您可以使用以下内容来查看%和“真模数”之间的差异:
var modTest =
from a in Enumerable.Range(-3, 6)
from b in Enumerable.Range(-3, 6)
where b != 0
let op = (a % b)
let mod = Mod(a,b)
let areSame = op == mod
select new
{
A = a,
B = b,
Operator = op,
Mod = mod,
Same = areSame
};
Console.WriteLine("A B A%B Mod(A,B) Equal?");
Console.WriteLine("-----------------------------------");
foreach (var result in modTest)
{
Console.WriteLine(
"{0,-3} | {1,-3} | {2,-5} | {3,-10} | {4,-6}",
result.A,
result.B,
result.Operator,
result.Mod,
result.Same);
}
结果:
A B A%B Mod(A,B) Equal?
-----------------------------------
-3 | -3 | 0 | 0 | True
-3 | -2 | -1 | -1 | True
-3 | -1 | 0 | 0 | True
-3 | 1 | 0 | 0 | True
-3 | 2 | -1 | 1 | False
-2 | -3 | -2 | -2 | True
-2 | -2 | 0 | 0 | True
-2 | -1 | 0 | 0 | True
-2 | 1 | 0 | 0 | True
-2 | 2 | 0 | 0 | True
-1 | -3 | -1 | -1 | True
-1 | -2 | -1 | -1 | True
-1 | -1 | 0 | 0 | True
-1 | 1 | 0 | 0 | True
-1 | 2 | -1 | 1 | False
0 | -3 | 0 | 0 | True
0 | -2 | 0 | 0 | True
0 | -1 | 0 | 0 | True
0 | 1 | 0 | 0 | True
0 | 2 | 0 | 0 | True
1 | -3 | 1 | -2 | False
1 | -2 | 1 | -1 | False
1 | -1 | 0 | 0 | True
1 | 1 | 0 | 0 | True
1 | 2 | 1 | 1 | True
2 | -3 | 2 | -1 | False
2 | -2 | 0 | 0 | True
2 | -1 | 0 | 0 | True
2 | 1 | 0 | 0 | True
2 | 2 | 0 | 0 | True
发布于 2016-05-07 00:11:17
从用户读取两个整数。然后计算/显示余数和商,
// When the larger integer is divided by the smaller integer
Console.WriteLine("Enter integer 1 please :");
double a5 = double.Parse(Console.ReadLine());
Console.WriteLine("Enter integer 2 please :");
double b5 = double.Parse(Console.ReadLine());
double div = a5 / b5;
Console.WriteLine(div);
double mod = a5 % b5;
Console.WriteLine(mod);
Console.ReadLine();
https://stackoverflow.com/questions/5383050
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