c# - Is a double really unsuitable for money?

Question

I always tell in c# a variable of type double is not suitable for money. All weird things could happen. But I can't seem to create an example to demonstrate some of these issues. Can anyone provide such an example?

(edit; this post was originally tagged C#; some replies refer to specific details of decimal, which therefore means System.Decimal).

(edit 2: I was specific asking for some c# code, so I don't think this is language agnostic only)

Answer 1

Very, very unsuitable. Use decimal.

double x = 3.65, y = 0.05, z = 3.7;
Console.WriteLine((x + y) == z); // false

(example from Jon's page here - recommended reading ;-p)