![]() Append each operator at the end of the postfix expression. If the current token is a closing bracket, ')', pop tokens from the stack until the corresponding opening bracket ‘(‘ is removed.If the current token is an opening bracket, '(', push it into the stack.We process the infix expression from left to right. The following algorithm will output a string in postfix order. The stack is also used to hold operators since an operator can’t be added to a postfix expression until both of its operands are processed. The stack is used to reverse the order of operators in postfix expression. ![]() The idea is to use the stack data structure to convert an infix expression to a postfix expression.
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