Input text analisator, parse string to function and calculate that.

See more:

C++

C

C#

Pascal

Text analisator, for example we have input string: "y = (x^2)/2", how can we calculate that in any language(C++, C#, C or Pascal)?

Some C++ prototype:
...
object = new string_analisator_object->set("y = (x^2)/2");
...
double y = 0;
double x = 0;
...
Ofcourse we know that is a "x":
...
array params = { (for example our x = 3.12) };
object->set(params);
...
double result = object->calculate();
...

So, maybe anyone have solutions?