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In c#
double tmp = 3.0 * 0.05; tmp = 0.15000000000000002
This has to do with money. The value is really $0.15, but the system wants to round it up to $0.16. 0.151 should probably be rounded up to 0.16, but not 0.15000000000000002
What are some ways I can get the correct numbers (ie 0.15, or 0.16 if the decimal is high enough).
Use a fixed-point variable type, or a base ten floating point type like Decimal. Floating point numbers are always somewhat inaccurate, and binary floating point representations add another layer of inaccuracy when they convert to/from base two.