C#中浮点数的比较

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原文链接：http://www.cnblogs.com/lyfe/archive/2013/01/03/2843434.html

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前几天去面试，被问到怎么比较两个浮点数的大小，当时只说了个大概，看得出来面试官不是太满意，回来特意查了一下，在MSDN上发现了比较浮点数是否相等的不错的方法：

// Initialize two doubles with apparently identical values
double double1 = .33333;
double double2 = (double) 1/3;
// Define the tolerance for variation in their values
double difference = double1 * .0001;

// Compare the values
// The output to the console indicates that the two values are equal
if (Math.Abs(double1 - double2) <= difference)
   Console.WriteLine("double1 and double2 are equal.");
else
   Console.WriteLine("double1 and double2 are unequal.");