Revision
So you think you can count
6. Binary arithmetic is not exact
Round and other functions
Revision and practice

## Instruction

Ooops… something went wrong. Why did we get something so odd?

The type of columns weight and height is real, which is a floating point number. The internal representation here is binary arithmetic. It means that not all decimal numbers can be represented exactly. The computations are also not performed exactly - as we can see.

What can be done about it? Nothing :) That's the way binary arithmetic works. If you need exact computations, you have to use a decimal type.

A thing to remember: When you deal with money values, you should always use a decimal type. Floating point numbers are for "scientific" computations on various measurements, like weight and height.

## Exercise

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