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View Compilation Error

0_0_16381821_27110\Main.java:4: 错误: 找不到符号
		Scanner sc = new Scanner(System.in);
		^
  符号:   类 Scanner
  位置: 类 Main
0_0_16381821_27110\Main.java:4: 错误: 找不到符号
		Scanner sc = new Scanner(System.in);
		                 ^
  符号:   类 Scanner
  位置: 类 Main
0_0_16381821_27110\Main.java:9: 错误: 找不到符号
			BigDecimal bd1 =  sc.nextBigDecimal();
			^
  符号:   类 BigDecimal
  位置: 类 Main
0_0_16381821_27110\Main.java:10: 错误: 找不到符号
			BigDecimal bd2 = sc.nextBigDecimal();
			^
  符号:   类 BigDecimal
  位置: 类 Main
4 个错误


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