static int find_k ( int a , int b ) {
  if ( ( a + b ) % 2 == 0 ) return ( ( a + b ) / 2 ) ;
  return - 1 ;
}

static int find_k ( int a , int b ) { if ( ( a + b ) % 2 == 0 ) return ( ( a + b ) / 2 ) ; return - 1 ; }
(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))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (return_statement (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal))))) (return_statement (unary_expression operand: (decimal_integer_literal)))))