ArrowRoundMode

取得不含小數的整數部分 (亦稱 “trunc”) GARROW_ROUND_TOWARDS_INFINITY, 以 GARROW_ROUND_MODE_DOWN 規則捨入負值，並以 UP 規則捨入正值 (亦稱 “away from zero”) GARROW_ROUND_HALF_DOWN, 以 GARROW_ROUND_MODE_DOWN 規則捨入平手值 (亦稱 “round half towards negative infinity”) GARROW_ROUND_HALF_UP, 以 GARROW_ROUND_MODE_UP 規則捨入平手值 (亦稱 “round half towards positive infinity”) GARROW_ROUND_HALF_TOWARDS_ZERO, 以 GARROW_ROUND_MODE_TOWARDS_ZERO 規則捨入平手值 (亦稱 “round half away from infinity”) GARROW_ROUND_HALF_TOWARDS_INFINITY, 以 GARROW_ROUND_MODE_TOWARDS_INFINITY 規則捨入平手值 (亦稱 “round half away from zero”) GARROW_ROUND_HALF_TO_EVEN, 將平手值捨入至最接近的偶數整數 GARROW_ROUND_HALF_TO_ODD, 將平手值捨入至最接近的奇數整數。