I need help with an RPN Calculator C++ program:

-Implement a RPN calculator: develop a C++ program that implements an interactive calculator for postfix arithmetic. -first step is to create a dynamic stack implementation that can handle evaluation of an arbitrary long expression (you are not allowed to use the collection classes). -Your program will then check to see whether the given expression contains a syntax error, a stack underflow error, or a too many operands error, in that order. If the syntax of the expression is erroneous, your program should display an appropriate error message. -program has to use a stack data structure to evaluate each valid postfix arithmetic expression. Each operand must be converted from an input substring to the numerical value represented by that substring, and then pushed onto the operand stack. To evaluate each operator, your program must pop the stack to retrieve the operand(s), perform the specified operation on the operand(s), and push the result back onto the stack. Note that for subtraction and division, operand order is critical: the first number popped from the stack should be used as the second operand, while the second number popped from the stack should be used as the first operand. Your program must interactively display the value of the given expression. After processing the first expression, your program should ask the user whether he or she wishes to enter another expression, and should repeat the entire expression evaluation process until the user responds negatively.