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View Compilation Error

0_0_20592289_8328\Main.java:1: 错误: 需要class, interface或enum
    Scanner sc=new Scanner(System.in);
    ^
0_0_20592289_8328\Main.java:2: 错误: 需要class, interface或enum
    while(sc.hasNext()){
    ^
0_0_20592289_8328\Main.java:4: 错误: 需要class, interface或enum
      if(n==0){
      ^
0_0_20592289_8328\Main.java:6: 错误: 需要class, interface或enum
      }
      ^
0_0_20592289_8328\Main.java:8: 错误: 需要class, interface或enum
      System.out.println(s);
      ^
0_0_20592289_8328\Main.java:9: 错误: 需要class, interface或enum
    }
    ^
0_0_20592289_8328\Main.java:11: 错误: 需要class, interface或enum
  public static int cal(int n){
                ^
0_0_20592289_8328\Main.java:13: 错误: 需要class, interface或enum
  	if(n<=4){
  	^
0_0_20592289_8328\Main.java:15: 错误: 需要class, interface或enum
  	}else{
  	^
0_0_20592289_8328\Main.java:17: 错误: 需要class, interface或enum
  	}
  	^
0_0_20592289_8328\Main.java:19: 错误: 需要class, interface或enum
  }
  ^
11 个错误


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