PYTHON: Arithmetic Operators
| + |
Addition |
x + y |
Simples! |
| - |
Subtraction |
x - y |
Simples! |
| * |
Multiplication |
x * y |
Computers always use '*' rather than 'x' for multiplication. |
| / |
Division |
x / y |
Computers always use '/' rather than '÷' for division. |
| % |
Modulus |
x % y |
A modulus is the number at which we start over when we are dealing with modular arithmetic.
For example, when telling the time on a clock we are dealing with a modulus of 12.
Therefore:
print(15%12)
will result in an output of 3 because 15:00h on a 24 hour clock is 3 o'clock in the afternoon.
The output number will always be smaller than the modulus we have set.
So, print(24%12) will result in an output of 0 |
| ** |
Exponentiation |
x ** y |
This is raising a number to a power - for example 32 is 3 raised to the power of 2 - 3 is the 'base number' and 2 is the power it is raised to or the exponent.
Therefore:
print(3**2)
will result in 9 as (3 x 3) = 9
whereas
print(2**3)
will result in 8 as (2 x 2 x 2) = 8 |
| // |
Floor division |
x // y |
Floor division is a normal division operation except that it only returns the integer value of the division sum - it ignores any decimal or fraction that forms part of the answer.
Therefore:
print(3//2)
will result in 1 as (3 / 2) = 1.5 = 1
and
print(2//3)
will result in 0 as (2 / 3) = 0.67 = 0 |
