fn main() { println ! ("10 + 2 = {}", 10 + 2) ; println ! ("10 - 2 = {}", 10 - 2) ; println ! ("10 * 2 = {}", 10 * 2) ; println ! ("10 / 2 = {}", 10 / 2) ; println ! ("10 % 2 = {}", 10 % 2) ; }