convert an expresion in a result

[xtremetechnology]

i have in a textbox "1+2+3". How can i convert this string to find the result aka 6 ?

[Jun Du]

"1+2+3" from the textbox is just a string. How to interpret it is entirely up to you. So, in order to obtain the result, you need to write your own parsing rules and calculating logic.

Best, Jun

[xtremetechnology]

ok! But how could i interpret "+" like + operator ? I am thinking to split the string "1+2+3", 1,2 and 3 are numbers, integer, but "+" what type it is?

[Jun Du]

That type of string can be split to two categories: operands and operators. Operands are simply numbers. With operators, you cast them one by one. Pseudo code may be like this:

//...
switch(operator1)
{
case "+":
result = operand1+operand2;
break;
case "-":
result = operand1-operand2;
break;
//...
}

I am not aware of any shortcuts in this regard.

Best, Jun

[Jaiprakash M Bankolli]

First you need to split "+" into an array Then each of the array value needs to be converted or Parsed and added

Regards, Jaiprakash M Bankolli jaiprakash.bankolli@gmail.com http://jaiprakash.blog.com/

[Leslie Sanford]

You'll need to parse the strings into tokens and go from there. One approach is to use a recursive decent parser[^].

[sherifffruitfly]

Google "lex yacc".