按位浮点到整数

问题描述

我正在尝试找出算法，但是我在google上得到的全部是通过强制转换来实现的.我需要知道细节.

I am trying to figure out the algorithm to this but all I get with google is doing it with casting. I need to know the details.

因此，如果我们有一个float x并想返回其二进制表示形式，那我们需要做什么?

So if we have a float x and want to return its binary representation what do we need to do?

我知道我们需要返回浮点数(如果其NaN或无穷大)，但是返回步骤是什么?

I know we need to return the float if its NaN or a infinity but otherwise what are the steps?

编辑

该函数将一个无符号的int用作浮点数，然后返回该数字表示的整数.我不能使用强制转换，只能使用条件运算符和按位运算符.

The function takes in an unsigned int, to be used as if it was a float, and then return the integer the number represents. I cannot use casting, just conditionals and bit-wise operators.

推荐答案

或者，使用联合:

typedef union
{
    float f_;
    int   i_;
} FloatBits;

FloatBits fb;

fb.f_ = 1.5;

然后，fb.i_包含映射到int的浮点数，以允许提取位.同样，关于类型大小的常见假设-您可以使用sizeof进行验证.

Then fb.i_ contains the float mapped onto an int to allow extraction of the bits. Again, usual assunptions about the size of types - you can verify these using sizeof.

使用这种方法，您可以直接设置fb.i_中的位，然后将它们映射回float中.

Using this approach, you can play with setting the bits in fb.i_ directly and seeing them mapped back into the float.

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