How to Calculate Real Numbers?

Real numbers are any number between zero and one. Pie is a real number, but not a rational number. Anything that's useful is usually computable. You can't denumerate the real numbers, but you can enumerate all the strings in the english language,. A la anda proven not computable, but it tells us something about how programming works. And i think that these unknowable numbers have same role in mathematics as they do in computers.