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View Compilation Error

0_0_8128677_5008\Main.java:2: 类 add 是公共的,应在名为 add.java 的文件中声明
public class add{
       ^
0_0_8128677_5008\Main.java:4: 找不到符号
符号: 构造函数 Scanner()
位置: 类 java.util.Scanner
      Scanner input=new Scanner();
                    ^
0_0_8128677_5008\Main.java:7: 找不到符号
符号: 方法 nextDoublr()
位置: 类 java.util.Scanner
      double b=input.nextDoublr();
                    ^
3 错误


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