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Working with floating point numbers can be fun. Typically, when working with amounts, you automatically think of using a double type, unless the value is a whole number, then an int type is typically sufficient. A float or long can also work out, depending upon the size of a value. When dealing with money, though, these types are absolutely the worst thing you can use as they don't necessarily give you the right value, only the value that can be stored in a binary number format. Here is a short example that shows the perils of using a double for calculating a total, taking into account a discount, and adding in sales tax.