static boolean isDigitSumOne ( int nm ) {
  while ( nm > 9 ) {
    int sum_digit = 0 ;
    while ( nm > 0 ) {
      int digit = nm % 10 ;
      sum_digit = sum_digit + digit ;
      nm = nm / 10 ;
    }
    nm = sum_digit ;
  }
  if ( nm == 1 ) return true ;
  else return false ;
}

static boolean isDigitSumOne ( int nm ) { while ( nm > 9 ) { int sum_digit = 0 ; while ( nm > 0 ) { int digit = nm % 10 ; sum_digit = sum_digit + digit ; nm = nm / 10 ; } nm = sum_digit ; } if ( nm == 1 ) return true ; else return false ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (true)) alternative: (return_statement (false)))))