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 PythonEdit

Thus, if one enters

a = 3 print(type(a)) b = 3.14 print(type(b)) c = int(b) print(c)

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 , *Python* treats this number as a real number (not a whole number)!

from math import sqrt a = sqrt(100) print(a.is_integer())

# OperationsEdit

## Addition, subtraction and multiplicationEdit

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.

a=5 b=-8 print(a+b) print(a-b) print(a*b)