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View Compilation Error

0_0_10670752_1461\Main.java:1: 需要为 class、interface 或 enum
public static void main(String[] args) {
              ^
0_0_10670752_1461\Main.java:3: 需要为 class、interface 或 enum
        while(input.hasNext()){
        ^
0_0_10670752_1461\Main.java:5: 需要为 class、interface 或 enum
            BigInteger bnum;
            ^
0_0_10670752_1461\Main.java:6: 需要为 class、interface 或 enum
            bnum = new BigInteger("1");
            ^
0_0_10670752_1461\Main.java:7: 需要为 class、interface 或 enum
            if(n>=3) bnum = bnum.shiftLeft(n-2);
            ^
0_0_10670752_1461\Main.java:8: 需要为 class、interface 或 enum
            System.out.println(bnum);
            ^
0_0_10670752_1461\Main.java:9: 需要为 class、interface 或 enum
        }
        ^
7 错误


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