第三章第三十題（當前時間）(Current time)

• *3.30（當前時間）修改編程練習題2.8，以12小時時鐘制顯示小時數。
  下面是一個運行示例：
  Enter the time zone offset to GMT:-5
  The current time is 4:50:34 AM

  *3.30(Current time) Revise Programming Exercise 2.8 to display the hour using a 12-hour clock.
  Here is a sample run:
  Enter the time zone offset to GMT:-5
  The current time is 4:50:34 AM

• 參考代碼：

package chapter03;import java.util.Scanner;public class Code_30 {public static void main(String[] args) {int ZoneOffset;long CurrHours,CurrMinutes,CurrSeconds;long CurrentMilliSeconds;CurrentMilliSeconds = System.currentTimeMillis();CurrSeconds = CurrentMilliSeconds / 1000 % 60;CurrMinutes = CurrentMilliSeconds / 1000 / 60 % 60;CurrHours = CurrentMilliSeconds / 1000 / 60 / 60 % 24;System.out.print("Enter the time zone offset to GMT : ");Scanner ZoneOffsetInput = new Scanner(System.in);ZoneOffset = ZoneOffsetInput.nextInt();CurrHours = (CurrHours + ZoneOffset + 24) % 24;if(CurrHours <= 12)System.out.println("The current time is "+ CurrHours + ":" + CurrMinutes + ":" + CurrSeconds + " AM");else{CurrHours %= 12;System.out.println("The current time is "+ CurrHours + ":" + CurrMinutes + ":" + CurrSeconds + " PM");}ZoneOffsetInput.close();} }

• 結果顯示：

Enter the time zone offset to GMT : 8 The current time is 11:15:40 AMProcess finished with exit code 0

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