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View Compilation Error

0_0_20572663_15662\Main.java:7: 错误: 找不到符号
        sum+=cin.nextInt();
        ^
  符号:   变量 sum
  位置: 类 Main
0_0_20572663_15662\Main.java:9: 错误: 找不到符号
System.out.println(sum);
                   ^
  符号:   变量 sum
  位置: 类 Main
2 个错误


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