A simple command line program that acts as a calculator. The calculator only performs on the operators "add" and "multiply". Additionally, since it only considers the digits, it only works on natural numbers.
Examples: (in Linux)
$ ./calc.py "1"
>> 1
$ ./calc.py "(add 3 4)"
>> 7
$ ./calc.py "(multiply 2 12)"
>> 24
$ ./calc.py "(add 3 (add (multiply 35 3) 3))"
>> 111
Examples: (In Windows)
>python calc.py "1"
>> 1
>python calc.py "(add 3 4)"
>> 7
>python calc.py "(multiply 2 12)"
>> 24
>python calc.py "(add 3 (add (multiply 35 3) 3))"
>> 111