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View Compilation Error

0_0_18379491_6538\Main.java:9: 错误: 找不到符号
              a = in.nextInt();
              ^
  符号:   变量 a
  位置: 类 Main
0_0_18379491_6538\Main.java:11: 错误: 找不到符号
            System.out.println(((1+a)*a)/2+"\n\n");
                                   ^
  符号:   变量 a
  位置: 类 Main
0_0_18379491_6538\Main.java:11: 错误: 找不到符号
            System.out.println(((1+a)*a)/2+"\n\n");
                                      ^
  符号:   变量 a
  位置: 类 Main
3 个错误


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