static void reverse ( String str , int x ) {
  int n = ( str . length ( ) - x ) / 2 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) System . out . print ( str . charAt ( i ) ) ;
  for ( int i = n + x - 1 ;
  i >= n ;
  i -- ) System . out . print ( str . charAt ( i ) ) ;
  for ( int i = n + x ;
  i < str . length ( ) ;
  i ++ ) System . out . print ( str . charAt ( i ) ) ;
}

static void reverse ( String str , int x ) { int n = ( str . length ( ) - x ) / 2 ; for ( int i = 0 ; i < n ; i ++ ) System . out . print ( str . charAt ( i ) ) ; for ( int i = n + x - 1 ; i >= n ; i -- ) System . out . print ( str . charAt ( i ) ) ; for ( int i = n + x ; i < str . length ( ) ; i ++ ) System . out . print ( str . charAt ( i ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (identifier))) right: (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))))