# Use Fixed-Points

To compute decimals, there are two options. One is fixed-point and
the other is floating-point. Instead of explaining, I'll give you
examples.


Ex) $123.45

Fixed: 12345 cents
Float: $(1.2345 * 10^2)

Ex) $123.45 + $67.89

Fixed: 12345 cents + 6789 cents
Float: $(1.2345 * 10^2) + $(6.789 * 10^1)

Ex) 123.45 * 67.89

Fixed: (12345 * 6789 / 100) cents
Float: (1.2345 * 6.789) * 10^(2+1)


You might already understand why floating-point sucks. It's complex.
Because of that, it's also slow and more error-prone. So use fixed
points whenever you can.