其中循环有更好的表现？递增或递减？ [英] Which loop has better performance? Increment or decrement?

问题描述

  

可能重复：结果
  <一href=\"http://stackoverflow.com/questions/2823043/is-it-faster-to-count-down-than-it-is-to-count-up\">Is更快倒计时比它是计数？

该循环有更好的表现？我从一些地方的第二个好教训。但想知道为什么。

 的for（int i = 0; I＆LT; = 10;我++）
      {
               /*这个更好 ？*/
      }
  对于（INT I = 10; I＆GT; = 0;我 - ）
      {
               /*这个更好 ？*/
      }
 

解决方案

第二个可能会更好，因为它更容易比较 I 0比比较 I 10，但我认为你可以使用其中的任何一个，因为编译器会对其进行优化。

Possible Duplicate:
Is it faster to count down than it is to count up?

which loop has better performance? I have learnt from some where that second is better. But want to know reason why.

  for(int i=0;i<=10;i++)
      {
               /*This is better ?*/
      }


  for(int i=10;i>=0;i--)
      {
               /*This is better ?*/
      }

解决方案

The second "may" be better, because it's easier to compare i with 0 than to compare i with 10 but I think you can use any one of these, because compiler will optimize them.

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