Note: Do not use spaces in expression. A+B/C or 4+5/3 not A + B / C or 4 + 5 / 3
Infix -> Postfix & Prefix
This is a simple infix to prefix or postfix Converter.
Enter the Infix expression below in box and press Convert
Postfix : | Prefix :
Step 1: Add '')" to the end of the infix expression
Step 2: Push(o nto the stack
Step 3: Repeat until each character in the infix notation is scanned
IF a(is encountered, push it on the stack
IF an operand (whetheradigit oracharacter) is encountered, add it postfix expression.
IF a ")" is encountered, then
a. Repeatedly pop from stack and add it to the postfix expression until a "(" is encountered.
b. Discard the "(".That is, remove the(from stack and do not add it to the postfix expression
IF an operator O is encountered, then
a. Repeatedly pop from stack and add each operator ( popped from the stack) to the postfix expression which has the same precedence orahigher precedence than O
b. Push the operator to the stack
[END OF IF]
Step 4: Repeatedly pop from the stack and add it to the postfix expression until the stack is empty
Step 5: EXIT
Step 1: Reverse the infix string. Note that while reversing the string you must interchange left and right parentheses.
Step 2: Obtain the postfix expression of the infix expression Step 1.
Step 3: Reverse the postfix expression to get the prefix expression