# Smart calculator in Python

• Difficulty Level : Easy
• Last Updated : 11 Jan, 2022

Problem – This smart calculator works on the text statement also. The user need not provide algebraic expression always. It fetches the word form the command (given by the user) and then formulates the expression.
Examples:

```Input  : Hi calculator plz find the lcm of 4 and 8.
Output : 8

Input  : Hi smart plz find the  multiplication of 3 and 9.
Output : 27

Input  : Hi smart plz end the program.
Output : Thanks for enjoy with me.```

Code : Python code for smart calculation

## Python3

 `# main python proghram``response``=``[``'Welcome to smart calculator'``,``'My name is MONTY'``,``          ``'Thanks for enjoy with me '``,``'Sorry ,this is  beyond my ability'``]` `# fetching tokens from the text command``def` `extract_from_text(text):``    ``l``=``[]``    ``for` `t ``in` `text.split(``' '``):``        ``try``:``            ``l.append(``float``(t))``        ``except` `ValueError:``            ``pass``    ``return` `l` `# calculating LCM``def` `lcm(a,b):``    ``L``=``a ``if` `a>b ``else` `b``    ``while` `L<``=``a``*``b:``        ``if` `L``%``a``=``=``0` `and` `L``%``b``=``=``0``:``            ``return` `L``        ``L``+``=``1` `# calculating HCF``def` `hcf(a,b):``    ``H``=``a ``if` `a``=``1``:``        ``if` `a``%``H``=``=``0` `and` `b``%``H``=``=``0``:``            ``return` `H``        ``H``-``=``1` `# Addition``def` `add(a,b):``    ``return` `a``+``b` `# Subtraction``def` `sub(a,b):``    ``return` `a``-``b` `# Multiplication``def` `mul(a,b):``    ``return` `a``*``b` `# Division``def` `div(a,b):``    ``return` `a``/``b` `# Remainder``def` `mod(a,b):``    ``return` `a``%``b` `# Response to command``# printing - "Thanks for enjoy with me" on exit``def` `end():``    ``print``(response[``2``])``    ``input``(``'press enter key to exit'``)``    ``exit()`` ` `def` `myname():``    ``print``(response[``1``])``def` `sorry():``    ``print``(response[``3``])`` ` `# Operations - performed on the basis of text tokens``operations``=``{``'ADD'``:add,``'PLUS'``:add,``'SUM'``:add,``'ADDITION'``:add,``            ``'SUB'``:sub,``'SUBTRACT'``:sub, ``'MINUS'``:sub,``            ``'DIFFERENCE'``:sub,``'LCM'``:lcm,``'HCF'``:hcf,``            ``'PRODUCT'``:mul, ``'MULTIPLY'``:mul,``'MULTIPLICATION'``:mul,``            ``'DIVISION'``:div,``'MOD'``:mod,``'REMAINDER'``            ``:mod,``'MODULAS'``:mod}` `# commands``commands``=``{``'NAME'``:myname,``'EXIT'``:end,``'END'``:end,``'CLOSE'``:end}``         ` `print``(``'--------------'``+``response[``0``]``+``'------------'``)``print``(``'--------------'``+``response[``1``]``+``'--------------------'``)`` ` ` ` `while` `True``:``    ``print``()``    ``text``=``input``(``'enter your queries:  '``)``    ``for` `word ``in` `text.split(``' '``):``        ``if` `word.upper() ``in` `operations.keys():``            ``try``:``                ``l ``=` `extract_from_text(text)``                ``r ``=` `operations[word.upper()] (l[``0``],l[``1``])``                ``print``(r)``            ``except``:``                ``print``(``'something went wrong going plz enter again !!'``)``            ``finally``:``                      ``break``        ``elif` `word.upper() ``in` `commands.keys():``                      ``commands[word.upper()]()``                      ``break``    ``else``:        ``        ``sorry()`

Output:

```--------------Welcome to smart calculator------------
--------------My name is MONTY--------------------

enter your queries:  tell me the hcf of 4 and 8
4.0

enter your queries:  hi plz tell me 7 + 8
Sorry ,this is  beyond my ability

enter your queries:  pls add 7 and 8
15.0```

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