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# Units of Measure

The standard xod/units library contains a few nodes for converting some popular units. For example, Celsius to Fahrenheit, degrees to radians and so on.

One of these nodes (c-to-f) is already on the patch and the program shows temperature in Fahrenheit.

## Exercise #

Let’s improve the program to see a temperature in Fahrenheit only when the button is pressed.

1. Add if-else below button.
2. Link PRS with COND.
3. Link Tc with F.
4. Link output from c-to-f with T.
5. Link R with the second pin of concat.
6. Upload the program.

Great! However, we still get a “C” on the LCD, even when the temperature converted to the Fahrenheit. Let’s fix it.

1. Add one more if-else.
2. Link PRS to the new COND pin.
3. Bind "F" to the T pin, and "C" to the F pin.
4. Link R with the latest pin of the concat node.
5. Upload the program again.

## 👆 Remember the quotes #

As was mentioned, the if-else node can work with numbers and strings depending on the incoming value type. The "F" and "C" values you bind have to be put in quotes so that XOD knows what data type do you mean.

See the generic nodes guide for better understanding.

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