Covert infix notation to postfix notation:

Example:
Convert 4+2*3-6/2 to postfix expression.

Principle: store operators in a stack.

1. read 4 and write 4.

2. read + and push it to a stack.

3. read 2 and write 2.

4. read * and push it to the stack.

5. read 3 and write 3.

6. pop * out and write it.

7. pop + out and write it.

8. read - and push it to the stack.

9. read 6 and write 6.

10. read / and push it to the stack.

11. read 2 and write 2.

12. pop / and write it.

13. pop - and write it.