Add number within string

[swapnil-revankar]

Hi
I am working on a small script ,
string $math =textField -q -tx CalTF ;

// Result: 7+8-5*10 //

What i wanna do is evaluate the numbers within the string ,also the numbers within the string will change based on user input .Please help.Thanks in advance.

[david-shower]

creating a UI with a text field,and you can changing the value of the field by inputing any number,at the same time,you need to set the way for evaluating.