Operators
=========

.. contents:: :local:


Arithmetic operators
--------------------

There are 7 arithmetic operators ``+``, ``-``, ``*``, ``/``, ``//``, ``%``, ``**``. Use them to complete the lines of code to get the requested results. The precedence of the order of operations can be changed with parentheses ``(``, ``)``.


.. interactive_code_block:: 
   :caption: Add the required elementary arithmetic operators +, -, *, /

   a = 1
   b = 2
   c = 3

   # Complete the next line of code that the result is
   d = a  b  c  # = 7

   print(d)

.. SOLUTIONS:
   d = a + b * c  # 7


.. interactive_code_block:: 
   :caption: Add the required arithmetic operators division /, floor division //, and modulo %

   a = 7
   b = 3

   # Complete the next 3 lines of code that the results are
   c = a  b # = 1
   d = a  b # = 2
   e = a  b # = 2.333333333333333

   print(c, d, e, sep='\\n')  

.. SOLUTIONS:
   c = a % b # = 1
   d = a // b # = 2
   e = a / b # = 2.333333333333333


.. interactive_code_block:: 
   :caption: Add the required elementary arithmetic operators +, -, *, /, parentheses (, ) or the exponentiation operator **

   a = 1
   b = 2
   c = 3

   # Complete the next 2 lines of code that the result is
   d = a  b  c  # = 9
   e = a  b  c  # = 9
   # Find 2 different solutions

   print(d, e, sep='\\n')

.. SOLUTIONS:
   d = a + b ** c  # = 9
   e = (a + b) * c  # = 9


Compound assignments
--------------------

There are 7 compound assignments ``+=``, ``-=``, ``*=``, ``/=``, ``//=``, ``%=``, ``**=``. By writing e.g. ``a += 1`` they are shorter version of ``a = a + 1``.


.. interactive_code_block:: 
   :caption: Add the required compound assignments +=, -=, *=, /=, //=, %=, **=

   a = 1
   b = 2
   c = 3

   # Complete the next 3 lines of code that the results are
   a  b  # a = -1
   b  c  # b = 8
   c  a  # c = -3.0

   print(a, b, c, sep='\\n')

.. SOLUTIONS:
   a -= b  # a -> -1
   b **= c  # b -> 8
   c /= a  # c -> -3.0

.. SOLUTION:
   d = a + b * c  # 7


Comparison operators
--------------------

There are 6 comparison operators ``<``, ``<=``, ``==``, ``>=``, ``>``, ``!=``. Keep in mind that

  * the result of an expression with a comparison operator is always boolean, i.e. ``True`` or ``False``,
  * comparison operators have the lowest precedence, i.e. ``a + b < c`` is the same as ``(a + b) < c``,
  * and that ``True`` or ``False`` is treated as ``1`` or ``0`` if used in an arithmetic expression, i.e. ``(True + 2) * 3`` is the same as ``(1 + 2) * 3``.

.. interactive_code_block:: 
   :caption: Add the required comparison operators <, <=, ==, >=, >, !=

   a = 1
   b = 2
   c = 3

   # Complete the next 3 lines of code that the results are
   d = a  b  # = True
   e = a  b  # = True
   f = a  b  # = True
   # Find 3 different solutions

   print(d, e, f, sep='\\n')

.. SOLUTION:
   d = a !=  b  # = True
   e = a < b  # = True
   f = a <= b  # = True


.. interactive_code_block:: 
   :caption: Add the required elementary arithmetic +, -, *, / and comparison operators <, <=, ==, >=, >, !=

   a = 1
   b = 2
   c = 3

   # Complete the next 2 lines of code that the results are
   d = a + b  c  # = True
   e = a > b  c  # = True

   print(d, e, sep='\\n')

.. SOLUTION:
   d = a + b == c  # = True
   e = a > b - c  # = True


.. interactive_code_block:: 
   :caption: Add the required elementary arithmetic +, -, *, /, comparison operators <, <=, ==, >=, >, !=, and parentheses (, )

   a = 1
   b = 2
   c = 3

   # Complete the next 3 lines of code that the results are
   d = a  (b > c)  # = 0
   e = a != b * c  # = 3
   f = a < b + b ** c  # 9

   print(d, e, f, sep='\\n')

.. SOLUTION:
   e = a * (b > c)  # = 0
   d = (a != b) * c  # = 3
   f = (a < b) + b ** c  # 9