static int summation ( int n ) {
  int sum = 0 , j = 1 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    sum = sum + j ;
    j = ( j * 10 ) + 1 ;
  }
  return sum ;
}

static int summation ( int n ) { int sum = 0 , j = 1 ; for ( int i = 1 ; i <= n ; i ++ ) { sum = sum + j ; j = ( j * 10 ) + 1 ; } return sum ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (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: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))))) (return_statement (identifier))))