段子能取二十字这么长的名字啊真的好长
问题描述
x = 4.2 - 0.1
vb.net 给出 4.1000000000000005
python给出4.1000000000000005
Excel给出4.1
Google calc 给出 4.1
Excel gives 4.1
Google calc gives 4.1
发生这种情况的原因是什么?
What is the reason this happens?
推荐答案
浮点/双精度.
您必须记住，在二进制中，4.1 = 4 + 1/10.1/10 是二进制的无限重复和，就像 1/9 是十进制的无限和.
You must remember that in binary, 4.1 = 4 + 1/10. 1/10 is an infinitely repeating sum in binary, much like 1/9 is an infinite sum in decimal.
