/********************************************************************
My simple calculator.
Revision history:
Revision by Microsegment.ru August 2017
Revision by Microsegment.ru Jule 2017
Revision by Microsegment.ru June 2017
Revision by Microsegment.ru May 2017
Originally written by Microsegment.ru
( info@microsegment.ru ) May 2017
Added in the new version:
1. Fixed problem computing after the brackets.
2. Fixed function to update user variables.
About the program:
In this calculator you can use:
1. Floating point numbers.
2. Following operators:
'+' - sum,
'-' - difference,
'*' - multiplication,
'/' - division,
'%' - modulo,
'!' - factorial an expression,
'=' - an assignment (to the left of equal
sign variable) or comparison (if the left
number of expression).
3. Braces:
'{...}' - figure (priority),
'(...)' - round.
4. Any custom variables
starting with Latin letters
containing Latin letters,
numbers and underscope,
in particular, constant variables:
'pi' - number pi (3.1415926535),
'e' - number e (2.7182818284).
5. Function:
'sqrt(...)' - calculating
the square root,
'pow(.,.)' - number raised to a power,
'info', 'help' - getting help.
Press 'Space' to separate solutions.
Press 'Enter' to execute commands.
Algorithm:
The program receives a custom string. All characters
of the user-defined string are converted to tokens
and stored in a vector with lexemes. Each token in the vector
contains information: an identification symbol, a value,
a string with a variable name.
Then, among the lexemes, addition, multiplication, etc.
are performed. Also operations with constants,
like pi and e, and calculation of the expressions enclosed
in the program, for example sqrt() and pow() are possible.
After each operation, the token-operators or tokens-variables
take the value of the result of the operation, and
the remaining tokens participating in the operation
are deleted. If there is only one variable between the open
and closed parenthesis, or the operand of the token-bracket
on both sides will be deleted.
After all operations in the vector with lexemes, only
1 lexeme with the result of the last operation remains.
This value is the result of the calculations that
are given to the user.
********************************************************************/
//-------------------------------------------
#include "std_lib_facilities.h"
//-------------------------------------------
#include "header.h"
//-------------------------------------------
/********************************************
Function main().
********************************************/
//-------------------------------------------
int main()
try
{
calculator_calculation();
return 0;
}
// Treatment of unaccounted for custom errors
catch( ... )
{
cerr << "\n...exception!\n\n";
return 2;
}
//-------------------------------------------
