calculating user defined formulas (with c++)

Question

We would like to have user defined formulas in our c++ program. e.g. The value v = x + ( y - (z - 2)) / 2. Later in the program the user would define x,y and z -> t

Answer 1

Building your own parser for this should be a straight-forward operation:

) convert the equation from infix to postfix notation (a typical compsci assignment) (I'd use a stack) ) wait to get the values you want ) pop the stack of infix items, dropping the value for the variable in where needed ) display results