Python Expressive Puzzlers 3: Long Division

長整數的處理在每個程式語言都不同，例如我們會預期底下的Java程式碼會輸出 1000。

public class LongDivision {

public static void main(String[] args) {

final long MICROS_PER_DAY = 24 * 60 * 60 * 1000 * 1000;

final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000;

System.out.println(MICROS_PER_DAY / MILLIS_PER_DAY);

}

}

但是結果卻是5

public class LongDivision {

public static void main(String[] args) {

final long MICROS_PER_DAY = 24L * 60 * 60 * 1000 * 1000;

final long MILLIS_PER_DAY = 24L * 60 * 60 * 1000;

System.out.println(MICROS_PER_DAY / MILLIS_PER_DAY);

}

}

“Java Puzzlers”一書提醒讀者：「When working with large numbers, watch out for overflow — it’s a silent killer.」

那在 Python 裡呢？

MICROS_PER_DAY = 24L * 60 * 60 * 1000 * 1000

MILLIS_PER_DAY = 24L * 60 * 60 * 1000

print(MICROS_PER_DAY / MILLIS_PER_DAY)