[英]Integer math in c#
I have a menu of product brands that I want to split over 4 columns. 我有一个产品品牌菜单,我想分成4列。 So if I have 39 brands, then I want the maximum item count for each column to be 10 (with a single gap in the last column. Here's how I'm calculating the item count for a column (using C#):
因此,如果我有39个品牌,那么我希望每列的最大项目数为10(在最后一列中有一个间隙。这是我如何计算列的项目数(使用C#):
int ItemCount = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(BrandCount) / 4m));
All that conversion seems really ugly to me. 所有转换对我来说都很难看。 Is there a better way to do math on integers in C#?
有没有更好的方法在C#中对整数进行数学运算?
You can cast: 你可以施放:
int ItemCount = (int) Math.Ceiling( (decimal)BrandCount / 4m );
Also, because int
/ decimal
results in a decimal
you can remove one of the casts: 此外,因为
int
/ decimal
结果为decimal
您可以删除其中一个强制转换:
int ItemCount = (int) Math.Ceiling( BrandCount / 4m );
Why are you even using a decimal? 为什么你甚至使用小数?
int ItemCount = (BrandCount+3)/4;
The +3
makes sure you round up rather than down: +3
确保你向上而不是向下:
(37+3)/4 == 40/4 == 10
(38+3)/4 == 41/4 == 10
(39+3)/4 == 42/4 == 10
(40+3)/4 == 43/4 == 10
In general: 一般来说:
public uint DivUp(uint num, uint denom)
{
return (num + denom - 1) / denom;
}
A longer alternative with Mod. Mod的更长的选择。
ItemCount = BrandCount / 4;
if (BrandCount%4 > 0) ItemCount++;
Perhaps try something like this ... Assuming BrandCount
is an integer. 也许尝试这样的事情......假设
BrandCount
是一个整数。 You still have the same casts, but it might be clearer: 你仍然有相同的演员,但它可能更清楚:
int ItemCount = (int)(Math.Ceiling(BrandCount / 4m));
I'm not a huge fan of the Convert
class, and I avoid it whenever possible. 我不是
Convert
类的忠实粉丝,我尽可能避免使用它。 It always seems to make my code illegible. 它似乎总是使我的代码难以辨认。
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