The Crypto Currency Tracker monitors the value of three different digital currencies — Bitcoin, Litecoin, and Dogecoin — and compares them each against the United States dollar.
Not only does the code pull digital currency values from the internet, but it also stores the old value in a variable called,
Retention of the last value is done to display it on the lower line of the 16×2 LCD; the top line is the current value.
The image below shows Bitcoin, or BTC, with a USD current value of 587.46 and a previous value of 587.22….
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