Our Postfix to Prefix converter toolhelps you convert an expression written in postfix notation to its equivalent prefix notation.
Steps to Use Postfix to Prefix Converter
Step 1: Enter your postfix expression in the text box below.
Step 2: Click the "Convert" button.
Step 3: The equivalent prefix expression will be displayed below.
Postfix and Prefix Notation
Infix notation is the standard way we write mathematical expressions, with operators placed between operands (e.g., 2 + 3). Postfix notation puts operators after operands (e.g., 2 3 +), while prefix notation places operators before operands (e.g., + 2 3).
Example:
Postfix: 2 3 +
Prefix: + 2 3
How to Convert Postfix to Prefix Expression
- Scan the given postfix expression from left to right character by character.
- If the character is an operand, push it into the stack.
- But if the character is an operator, pop the top two values from the stack. Concatenate this operator with these two values (operator+2 nd top value+1 st top value) to get a new string.
- Now push this resulting string back into the stack.
- Repeat this process until the end of the postfix expression. Now the value in the stack is the desired prefix expression.
Prefix Notation is in the stack that is *+ABc.
Important Notes:
- This converter supports basic arithmetic operators like addition (+), subtraction (-), multiplication (*), and division (/).
- The operands should be separated by spaces.
- Make sure the expression is well-formed and follows postfix notation rules.