什么是浮点/舍入误差的简单示例？ [英] What is a simple example of floating point/rounding error?

问题描述

使用浮点变量时，我听说过错误。现在我想解决这个难题，我想我得到一些舍入/浮点错误。所以我终于要弄清楚浮点错误的基础。

什么是浮点/舍入误差的一个简单例子（最好是在C ++中） p>

编辑：例如，我有一个具有成功概率p的事件。我做这个事件10次（p不改变，所有试验是独立的）。 2次成功试验的概率是多少？我有这样编码：

  double p_2x_success = pow（1-p，（double）8）* pow double）2）*（double）choose（8，2）;这是一个浮点错误的机会吗？
 
 

=



$ b < d2>解决方案

  for（double d = 0; d！= 0.3; d + = 0.1）; // never terminated 
  




I've heard of "error" when using floating point variables. Now I'm trying to solve this puzzle and I think I'm getting some rounding/floating point error. So I'm finally going to figure out the basics of floating point error.

What is a simple example of floating point/rounding error (preferably in C++) ?

Edit: For example say I have an event that has probability p of succeeding. I do this event 10 times (p does not change and all trials are independent). What is the probability of exactly 2 successful trials? I have this coded as:

double p_2x_success = pow(1-p, (double)8) * pow(p, (double)2) * (double)choose(8, 2);

Is this an opportunity for floating point error?

解决方案

 for(double d = 0; d != 0.3; d += 0.1); // never terminates

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