A standard electronic calculator does all your calculations to a particular accuracy, say ten decimal digits. With Mathematica
, however, you can often get exact
You can tell Mathematica
to give you an approximate numerical result, just as a calculator would, by ending your input with //N
. The N
stands for "numerical". It must be a capital letter. "Special Ways to Input Expressions"
will explain what the //
When you type in an integer like 7
assumes that it is exact. If you type in a number like 4.5
, with an explicit decimal point, Mathematica
assumes that it is accurate only to a fixed number of decimal places.