浮点或者双精度浮点的内存空间是限定了的，所以某些值不能被表示。

The memory space of a float or double value is limited, so some values cannot be represented.

youdao

如果我们回想一下我们一开始讲过的数据对象的种类，浮点数，整数，字符串，它们实际上有相同的行为方式。

If we go back up to the kinds of data objects we started with, floats, ints, strings, they actually behave the same way.

youdao

如果任意一个操作数是浮点型的，则所有操作数都将按浮点型进行计算，并且结果也是浮点型的。

If any of the operands is a float, then all operands are evaluated as floats, and the results are floats.

youdao

And as you might expect, I'm going to then try and see if I can convert that into a float.

正如你希望的我要试着把他们转化为浮点数,等一等。

麻省理工公开课 - 计算机科学及编程导论课程节选

C So here I'm declaring a variable called c, and I'm pretty much translating the formula from the slide using the characters on my keyboard to a floating point value.

这里我声明了一个变量，然后我把那个幻灯片上的公式,用键盘上的字符翻译成了,浮点数值。

哈佛公开课 - 计算机科学课程节选

OK, says it says enter a float. I give it something that can be converted into a float, it says fine. I'm going to go back and run it again though. If I run it again, it says enter a float.

好了，看到他说输入一个浮点数,我输入它可以转换为浮点数的值,那没问题，我回过来再运行一遍,如果我再运行一遍。

麻省理工公开课 - 计算机科学及编程导论课程节选