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打卡

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#1 Created at ... [Delete] [Delete and Lock User] 
System.out.print("上次成绩：");int lastScore = scanner.nextInt();System.out.print("本次成绩：");int Score = scanner.nextInt();double percent = (double)(Score-lastScore)/lastScore*100;System.out.printf("百分比为：%.2f%%\n",percent);
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