올림 Math.Ceiling(double a) 사용 double[] numbers = {1.0d, 1.1d, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d, 1.8d, 1.9d}; foreach (var number in numbers) { Console.WriteLine($"{number} => {Math.Ceiling(number)}"); } // output 1 => 1 1.1 => 2 1.2 => 2 1.3 => 2 1.4 => 2 1.5 => 2 1.6 => 2 1.7 => 2 1.8 => 2 1.9 => 2 버림 Math.Truncate(double a) 사용 double[] numbers = {1.0d, 1.1d, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d..