# Postfix to infix online dating, the general approach

The result 1 will be pushed on stack. The first pop is the second operand and the second pop is the first operand. Another way to think about the solution is that whenever an operator is seen on the input, the two most recent operands will be used in the evaluation.

## Infix to Postfix Convertor

The order of the operators in the original expression is reversed in the resulting postfix expression. You can get the expression from the keyboard and use the enter key to finish the expression. The number 2 will be stored in op2 while number 8 in op1. Moving Operators to the Right for Postfix Notation If we do the same thing but instead of moving the symbol to the position of the right parenthesis, we move it to the left, we get prefix notation see Figure 7.

The operand needs not to be single digit. We leave this as an exercise at the end of the chapter. If the token is a left parenthesis, push it on the opstack. This way any operator that is compared against it will have higher precedence and will be placed on top of it.

When the input expression has been completely processed, the result is on the stack. The problem with this solution, however, is that it sometimes generates expressions with a lot of unnecessary parentheses.

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