C# System.Math 未识别
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System.Math un identified
提问by Gokul
using System;
using System.Math;
class test
{
public static void Main()
{
Console.Write("Enter any value: ");
string s=Console.ReadLine();
double n = double.Parse(s);
double r = Math.sqrt(n);
Console.WriteLine(r);
Console.ReadKey();
}
}
I feel that every thing is clear in this code, but this code is giving compile errors:
A using namespace directive can only be applied to namespaces; 'System.Math' is a type not a namespace
我觉得这段代码中的每一件事都很清楚,但是这段代码给出了编译错误:
using namespace 指令只能应用于命名空间;'System.Math' 是一种类型而不是命名空间
How to use math functions? Where do we get a list of all math functions available in Math class?
如何使用数学函数?我们从哪里获得 Math 类中所有可用数学函数的列表?
Thank You.
谢谢你。
采纳答案by Warty
Math is a static class, not a namespace. It is located in the System namespace.
Therefore, you only have to include the System namespace.
Simply use Math.Sqrt and drop the "using System.Math;" Note that it is Math.Sqrt and not Math.sqrt
Math 是一个静态类,而不是一个命名空间。它位于 System 命名空间中。
因此,您只需包含 System 命名空间。
只需使用 Math.Sqrt 并删除“using System.Math;” 请注意,它是 Math.Sqrt 而不是 Math.sqrt
Hope that helps ;-)
希望有帮助;-)
回答by Jonathan
You've got a case sensitivity problem
你有一个区分大小写的问题
double r = Math.Sqrt(n);
http://msdn.microsoft.com/en-us/library/system.math_members(VS.85).aspx
http://msdn.microsoft.com/en-us/library/system.math_members(VS.85).aspx
回答by Asad
remove using System.Math;
消除 using System.Math;
You do need to reference Math
class like above. using System;
is enough
您确实需要Math
像上面那样引用类。using System;
足够
For reference and sample use, see Math Class
有关参考和示例使用,请参阅数学类
回答by dashnick
Starting with C# 6.0, you can use
从 C# 6.0 开始,您可以使用
using static System.Math;
if you don't want to write Math.
all the time.
如果你不想一直写Math.
。