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View Compilation Error

0_0_34290530_10444\Main.java:8: 错误: 找不到符号
        if(n<0)
           ^
  符号:   变量 n
  位置: 类 Main
0_0_34290530_10444\Main.java:9: 错误: 找不到符号
            System.out.printf("%.2f\r\n",-n);
                                          ^
  符号:   变量 n
  位置: 类 Main
0_0_34290530_10444\Main.java:11: 错误: 找不到符号
            System.out.printf("%.2f\r\n",n);
                                         ^
  符号:   变量 n
  位置: 类 Main
3 个错误


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