Hello i need your help to implement this function "eval" ( line 21 on picture) in C++

the function returns the evaluation of the infix expression in vals.

In order to do this, you need to use the stack structure (wich contains the evaluation operands of postfix expression) that you can find in this folder:

https://drive.google.com/drive/folders/1hI5ATeOy-sM3_24a0XTYkEKeDViX0VfH

41 class Eval InFixf 6private: string _inFix; string _postFix; Stack opStack; 10 12 14 16public: int predcchar,char) bool isOperator(char); bool is0perand(char); void inFixzPostFixO; 17/s: infix expression 18 vals: array with the values of evaluation // example: if "A"(B4C)"