static int isFibonacci ( int n ) {
  if ( isPerfectSquare ( 5 * n * n + 4 ) || isPerfectSquare ( 5 * n * n - 4 ) ) return 1 ;
  return 0 ;
}

static int isFibonacci ( int n ) { if ( isPerfectSquare ( 5 * n * n + 4 ) || isPerfectSquare ( 5 * n * n - 4 ) ) return 1 ; return 0 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)) right: (decimal_integer_literal)))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)) right: (decimal_integer_literal)))))) consequence: (return_statement (decimal_integer_literal))) (return_statement (decimal_integer_literal))))