Int或Unsigned Int浮动而不收到警告 [英] Int or Unsigned Int to float without getting a warning

问题描述

有时我必须从无符号整数值转换为浮点数。例如，我的图形引擎接受一个 SetScale（float x，float y，float z）与浮动，我有一个对象，有一定的大小作为 unsigned int 。我想将unsigned int转换为一个float来正确缩放一个实体（这个例子非常具体，但我希望你得到的点）。

Sometimes I have to convert from an unsigned integer value to a float. For example, my graphics engine takes in a SetScale(float x, float y, float z) with floats and I have an object that has a certain size as an unsigned int. I want to convert the unsigned int to a float to properly scale an entity (the example is very specific but I hope you get the point).

现在，我通常做的是：

unsigned int size = 5;
float scale = float(size);
My3DObject->SetScale(scale , scale , scale);

。是否有更好的方法比使用 float（）？

注意：我无法触摸图形API。我必须使用SetScale（）函数，它接受浮点数。此外，我也不能碰大小，它必须是一个unsigned int。我相信有很多其他的例子，同样的问题。

Notes: I cannot touch the graphics API. I have to use the SetScale() function which takes in floats. Moreover, I also cannot touch the size, it has to be an unsigned int. I am sure there are plenty of other examples with the same 'problem'. The above can be applied to any conversion that needs to be done and you as a programmer have little choice in the matter.

推荐答案

有一个从 unsigned int 到 float 的隐式转换，不必要。

There is an implicit conversion from unsigned int to float, so the cast is strictly unnecessary.

如果您的编译器发出警告，那么使用转换来停止警告并没有什么问题。请注意，如果 size 非常大，它可能不能由 float 完全表示。

If your compiler issues a warning, then there isn't really anything wrong with using a cast to silence the warning. Just be aware that if size is very large it may not be representable exactly by a float.

这篇关于Int或Unsigned Int浮动而不收到警告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！