Show simple code using Stack in C++ and in order. I just want to understand it fully.

Algorithm: InfixToPostfix

Input: Infix expression I, a temporary empty stack S

Output: Postfix expression P (which is initially empty) corresponding to the Infix expression I 1. FOR each symbol in I from left to right do 2. if the symbol is an operand then 3. Append the symbol to P 4. else-If the symbol is an operator then 5. Pop every operator on S that is above the most recently scanned left parenthesis and has precedence higher than or equal to that of the new operator symbol, and then append to P 6. Push the new operator symbol onto S 7. else-If the symbol is an opening (left) parenthesis then 8. Push the symbol onto S 9. else-If the symbol is a closing (right) parenthesis then 10. all operators down to the most recently scanned left parenthesis are popped from S and appended to P | 11. discard this pair of parentheses 12. end if 13. end FOR 14. Pop all operators from S and append to P