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View Compilation Error

0_0_30506230_7857\Main.java:8: 错误: 找不到符号
               while(in.hasNext())
                     ^
  符号:   变量 in
  位置: 类 Main
0_0_30506230_7857\Main.java:10: 错误: 找不到符号
                     int a=in.nextInt();
                           ^
  符号:   变量 in
  位置: 类 Main
0_0_30506230_7857\Main.java:11: 错误: 找不到符号
                     int b=in.nextInt();
                           ^
  符号:   变量 in
  位置: 类 Main
0_0_30506230_7857\Main.java:14: 错误: 找不到符号
                    System.out.println(c);
                                       ^
  符号:   变量 c
  位置: 类 Main
4 个错误


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