Mathematics with Python and Ruby/Whole numbers in Python

Whole numbers are not the only numbers, as we will see in the following chapters. So what does Python do to know if a number is whole? As the language is weakly typed, it must guess. The criterium is simple: in order for a number to be whole, it must not have a decimal point.



=Whole numbers in Python=

Thus, if one enters

one notes that Python knows that a is whole, that b is not, and that c can be whole although it was obtained from b (which is real).

Certain calculations that should give a whole result do not always do so in Python. For example, while $$\sqrt{100} \in \N$$, Python treats this number as a real number (not a whole number)!

=Operations=

Addition, subtraction and multiplication
The first three operations are denoted by the symbols +, - and * as in most programming languages. The sum, difference and product of two (or more) whole numbers are all integers.