Please use C++

Problem 2. Write a program to convert an infix expression to a postfix expression Input: an infix expression Output: the corresponding postfix expression Note: You must use the stack to implement this task. And you can use any one of the above stack implementations. Test your program using the following expressions: 1. (? + b) * c 2. (a - b) (c +d) 3. (a*b+c/d)/e