Right, and phones have had a calculator function or app since before smartphones. I see these apps, and world clocks, all the time. I will guess that some popu

Right, and phones have had a calculator function or app since before smartphones. I see these apps, and world clocks, all the time. I will guess that some popular programming textbook or online course assigns these tasks -- like why so many houses have vases and bowls obviously made by children at school art class.