The postfix operators have the highest precedence (the tightest binding) in expression evaluation.
Syntax
postfix-expression :
primary-expression
postfix-expression [ expression ]
postfix-expression ( argument-expression-list opt )
postfix-expression . identifier
postfix-expression –> identifier
postfix-expression ++
postfix-expression ––
Operators in this precedence level are the array subscripts, function calls, structure and union members, and postfix increment and decrement operators.