C＃中：我怎样做简单的算术，舍入，对整数？ [英] C#: How do I do simple math, with rounding, on integers?

问题描述

我想的等式的结果舍入到最接近的整数。
例如

  137 *（3/4）= 103 
  

考虑下面的不正确的代码。

  INT宽度1 = 4; 
 INT height1 = 3; 
 
 INT宽2 = 137; 
 INT身高2 =宽2 *（height1 /宽度1）; 
  

什么是用C＃进行整数数学的正确方法？

我真的要做到：

  INT身高2 =（int）的Math.Round（
（浮动）宽度2 *（（浮点）height1 /（浮点）宽度1）
）; 
  

解决方案

正如上面所说的，你应该做之前，乘法师。
反正你可以与铸造只除数写你的表达：

  INT身高2 =（INT）Math.Round（宽2 *（height1 /（浮点）宽度1））; 
  

i want the result of an equation rounded to the nearest integer. e.g.

137 * (3/4) = 103

Consider the following incorrect code.

int width1 = 4;
int height1 = 3;

int width2 = 137;
int height2 = width2 * (height1 / width1);

What is the proper way to perform "integer" math in C#?

Do i really have to do:

int height2 = (int)Math.Round(
      (float)width2 * ((float)height1 / (float)width1)
   );

解决方案

As said above, you should do the multiplication before the division. Anyway you could write your expression with casting only the divisor:

int height2 = (int)Math.Round(width2 * (height1 / (float)width1));

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