Other contributors have said "No parenthesis are needed in postfix expression Justify?" is the same question as "Why parenthesis are never needed in prefix or postfix notation?" If you believe that these are not asking the same thing and should be answered differently, click here
Why parenthesis are never needed in prefix or postfix notation?
Because there is not an "order of operations" in prefix or postfix notation. The order in which you put the numbers and operators is the order in which calculation occurs.
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//C PROGRAM TO CONVERT GIVEN VALID INFIX EXPRESSION INTO POSTFIX EXPRESSION USING STACKS. include<stdio.h>...