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View Compilation Error

0_0_1658053_4183\Main.java:3: 类 Calculate 是公共的,应在名为 Calculate.java 的文件中声明
public class Calculate 
       ^
0_0_1658053_4183\Main.java:12: 找不到符号
符号: 类 BufferedReader
位置: 类 Calculate
BufferedReader br =new BufferedReader(new InputStreamReader(System.in)); 
^
0_0_1658053_4183\Main.java:12: 找不到符号
符号: 类 BufferedReader
位置: 类 Calculate
BufferedReader br =new BufferedReader(new InputStreamReader(System.in)); 
                       ^
0_0_1658053_4183\Main.java:12: 找不到符号
符号: 类 InputStreamReader
位置: 类 Calculate
BufferedReader br =new BufferedReader(new InputStreamReader(System.in)); 
                                          ^
0_0_1658053_4183\Main.java:22: 找不到符号
符号: 类 IOException
位置: 类 Calculate
		}catch (IOException e){System.out.println("error");}
                        ^
5 错误


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