7. Numeric variables¶
Integers do not have decimal places:
42,-7Values of type integer in Python are called
intFloating point numbers have decimal places:
1.0,3.1415,
1234.56
+ Note that 1.0, even though it has a zero in the decimal part, is a floating point number
+ Values of type floating point in Python are called float.
7.1. Representation of numeric values¶
Internally, all numbers are represented with the binary system
This system only allows the digits
0or1Floating point numbers may not have a proper representation
in the binary system
+ Typing in the interpreter 3 * 0.1 will give us a response of: 0.30000000000000004
Try it here!
Python code: ```python # Declaring an integer variable a = 42 print(a) # Output: 42 print(type(a)) # Output: <class ‘int’>
# Declaring a floating point variable b = 1.0 print(b) # Output: 1.0 print(type(b)) # Output: <class ‘float’>
# Operations with numbers x = 3 y = 0.1 print(x * y) # Output: 0.30000000000000004 ```