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25.10. Exercises 1. Apply the postfix algorithm to the expression 1 2 + 3 * This example demonstrates one of the advantages of postfix-there is no need to use parentheses to control the order of operations. To get the same result in infix, we would have to write (1 + 2) * 3. 2. Write a postfix expression that is equivalent to 1 + 2 * 3. 27.9. Exercises 1 1. Modify print_tree_inorder so that it puts parentheses around every operator and pair of operands. Is the output correct and unambiguous? Are the parentheses always necessary?