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View Compilation Error

0_0_15985444_32528\Main.java:3: 错误: 类Test2011是公共的, 应在名为 Test2011.java 的文件中声明
public class Test2011{  
       ^
0_0_15985444_32528\Main.java:15: 错误: 找不到符号
                    sum = sum + (Math.pow(-1 , j+1) * (1 / j));                   
                    ^
  符号:   变量 sum
  位置: 类 Test2011
0_0_15985444_32528\Main.java:15: 错误: 找不到符号
                    sum = sum + (Math.pow(-1 , j+1) * (1 / j));                   
                          ^
  符号:   变量 sum
  位置: 类 Test2011
0_0_15985444_32528\Main.java:17: 错误: 找不到符号
                System.out.printf("%.2f",sum);  
                                         ^
  符号:   变量 sum
  位置: 类 Test2011
4 个错误


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