Calculator

Created by Antoine Angot

Write a program that do basic calculations.

Warning

You should work on this exercise with your own installation of Python, on your computer. Learn how for Mac OSX or Windows.

You need to be able to get basic operators such as `+`, `-` , `*`, `/`, `%` (modulo) and `^` (Exponentiation). Input will be integer numbers.

Your program will give a usage message if you don't give the three parameters.

For every other errors like if an operand is not an integer, you'll print an `input error`.

Examples

``````oa@localhost\$ ./solution.py 1 + 1
2
oa@localhost\$ ./solution.py
usage: ./solution.py a_number (an_operator +-*/%^) a_number
oa@localhost\$ ./solution.py 1 / 0
input error
oa@localhost\$
``````

On Mac and Linux (shell), to input an asterix to a python script you must type `\*` or `"*"`, such as:

``````mbp|110-\$ python solution.py 3 / 5
0.6
mbp|110-\$ python solution.py 3 + 5
8
mbp|110-\$ python solution.py 3 - 5
-2
mbp|110-\$ python solution.py 3 * 5
usage: python3 ./solution.py a_number (an_operator +-*/%^) a_number
mbp|110-\$ python solution.py 3 \* 5
15
``````

Similarly, on Windows with Command Prompt, `^` must be passed with double quotes: `"^"`.

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