public static int sumFromStart ( int num , int n , int rem ) {
  num /= ( ( int ) Math . pow ( 10 , rem ) ) ;
  int sum = 0 ;
  while ( num > 0 ) {
    sum += ( num % 10 ) ;
    num /= 10 ;
  }
  return sum ;
}

public static int sumFromStart ( int num , int n , int rem ) { num /= ( ( int ) Math . pow ( 10 , rem ) ) ; int sum = 0 ; while ( num > 0 ) { sum += ( num % 10 ) ; num /= 10 ; } return sum ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))))))) (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 (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))) (return_statement (identifier))))