static void push ( char ele ) {
  stack [ ++ top ] = ele ;
}

static void push ( char ele ) { stack [ ++ top ] = ele ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (update_expression (identifier))) right: (identifier)))))