计算逻辑问题？ [英] Calculate Logic problem ?

问题描述

您好我尝试编码计算逻辑

我宣布变量是双倍总数;



然后

价格= 123;

总计+ =（价格）+（价格* 7/100）;



结果= 131.61



然后我尝试减少总数（我的意思是删除价值）



现在

总计= 131.61

价格= 123;



然后我编码

总计 - =（价格）+（价格* 7 / 100）;



结果= 131.61



i试试看我的程序是cal = 131.61 - 131。 61

然后我制作一个文本框

textbox1.text =total;



结果= 1.36418654150816E -14

Hi i try coded Calculate Logic
I Announced varible is double total;

then
price = 123;
total += (price) + (price * 7 / 100);

Result = 131.61

then i try decrease total (i mean delete value)

now
total = 131.61
price = 123;

then i coded
total -= (price) + (price * 7 / 100);

Result = 131.61

i try see my program is cal = 131.61 - 131 .61
then i make a textbox
textbox1.text = ""total;

Result = 1.36418654150816E-14

推荐答案

Double很难表示完美的数字，如果你将它们重新定义为浮点数，你将得到零。除非你需要极高的精度，否则我会坚持使用花车。

Double's have a hard time representing perfect numbers, if you redefine them as floats, you will get zero. Unless you need extreme precision, I would stick with floats.

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