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View Compilation Error

0_0_28392069_24229\Main.java:7: 错误: 找不到符号
            a = scanner.nextInt();
            ^
  符号:   变量 a
  位置: 类 Main
0_0_28392069_24229\Main.java:8: 错误: 找不到符号
            b = scanner.nextInt();
            ^
  符号:   变量 b
  位置: 类 Main
0_0_28392069_24229\Main.java:9: 错误: 找不到符号
            System.out.println(a + b);
                               ^
  符号:   变量 a
  位置: 类 Main
0_0_28392069_24229\Main.java:9: 错误: 找不到符号
            System.out.println(a + b);
                                   ^
  符号:   变量 b
  位置: 类 Main
4 个错误


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