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View Compilation Error

0_0_26009312_13573\Main.java:4: 错误: 找不到符号
                while(in.hasNext()) {
                      ^
  符号:   变量 in
  位置: 类 Main
0_0_26009312_13573\Main.java:5: 错误: 找不到符号
		 String s1 = in.next();
		             ^
  符号:   变量 in
  位置: 类 Main
0_0_26009312_13573\Main.java:6: 错误: 找不到符号
                 String s2 = in.next();
                             ^
  符号:   变量 in
  位置: 类 Main
3 个错误


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