.net 如何以 2 个精度转换为双精度 - 点后的字符串？
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How to convert to double with 2 precision - string after dot?
提问by MonsterMMORPG
I want to convert this string: 0.55000000000000004to this double: 0.55.
How to do that?
我想把这个字符串: 转换0.55000000000000004成这个 double: 0.55。怎么做？
回答by mjyazdani
you can use this code to reduce precision part:
您可以使用此代码来降低精度部分：
double m = Math.Round(0.55000000000000004,2);
Result would be : 0.55
结果将是：0.55
回答by Felice Pollano
Is a string or a double? If it is a string:
是字符串还是双精度？如果是字符串：
double d = double.Parse(s,CultureInfo.InvariantCulture);
string s=string.Format("{0:0.00}",d);
if it is already a double just format using the second line.
如果它已经是使用第二行的双格式。
回答by Michael Borgwardt
There is nodouble 0.55 - the number cannot be accurately represented as a binary fraction. Which is probably the reason why you got that long string in the first place. You should probably be using the decimaltype instead of double.
有没有双0.55 -数量不能准确地表示为二进制分数。这可能是你首先得到那么长字符串的原因。您可能应该使用decimal类型而不是double.
Read The Floating-Point Guideto understand why.
阅读浮点指南以了解原因。
