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View Compilation Error

0_0_25428819_20816\Main.java:1: 错误: 类Hdu1002是公共的, 应在名为 Hdu1002.java 的文件中声明
public class Hdu1002 {
       ^
0_0_25428819_20816\Main.java:7: 错误: 找不到符号
     	Scanner scanf = new Scanner(System.in);
     	^
  符号:   类 Scanner
  位置: 类 Hdu1002
0_0_25428819_20816\Main.java:7: 错误: 找不到符号
     	Scanner scanf = new Scanner(System.in);
     	                    ^
  符号:   类 Scanner
  位置: 类 Hdu1002
0_0_25428819_20816\Main.java:11: 错误: 找不到符号
     		BigInteger a = scanf.nextBigInteger();
     		^
  符号:   类 BigInteger
  位置: 类 Hdu1002
0_0_25428819_20816\Main.java:12: 错误: 找不到符号
     		BigInteger b = scanf.nextBigInteger();
     		^
  符号:   类 BigInteger
  位置: 类 Hdu1002
0_0_25428819_20816\Main.java:13: 错误: 找不到符号
     		BigInteger sum = a.add(b);
     		^
  符号:   类 BigInteger
  位置: 类 Hdu1002
6 个错误


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