***关于自定义类型转换***

[zabaglione]

我自己写了下面的类型转换，但是编译的时候一直报错，
有高手知道原因吗？我感觉代码没有问题啊

c#代码

using System;

struct Currency
{
	public uint Dollars;
	public ushort Cents;
	
	public Currency(uint Dollars,ushort Cents)
	{
		this.Dollars = Dollars;
		this.Cents = Cents;
	}
	
	public override string ToString()
	{
		return string.Format("${0}.{1,-2:00}",Dollars,Cents);
	}
	
	public static implicit operator float(Currency value)
	{
		return value.Dollars + (value.Cents/100.01);
	}
}

public class Test
{
	public static void Main()
	{
		Currency Balance = new Currency(10,50);
		float D = Balance;
	}
}

编译的时候，就报错
Currency.cs(21,10): error CS0266: Cannot implicitly convert type 'double' to
'float'. An explicit conversion exists (are you missing a cast?)

[智商余额不足]

public static implicit operator float(Currency value)
{
   //return value.Dollars + (value.Cents/100.01);
   return value.Dollars + (value.Cents/100.01f);
}