Introduction to Float
Scientific notation is supported for input and output of floating
point numbers. A floating point number is written as a string of
digits containing a decimal point optionally followed by the letter "E",
and then the exponent. We begin by doing some calculations using
arbitrary precision floats. The default precision is twenty decimal
digits.
A decimal base for the exponent is assumed, so the number 1.234E2 denotes
1.234*10**2
The normal arithmetic operations are available for floating point numbers.
