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View Compilation Error

0_0_9906593_24192\Main.java:7: 找不到符号
符号: 类 BigDecimal
位置: 类 Main
        BigDecimal big1,big2;
        ^
0_0_9906593_24192\Main.java:8: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in);
        ^
0_0_9906593_24192\Main.java:8: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in);
                         ^
0_0_9906593_24192\Main.java:14: 找不到符号
符号: 类 BigDecimal
位置: 类 Main
            big1 = new BigDecimal(num1);
                       ^
0_0_9906593_24192\Main.java:15: 找不到符号
符号: 类 BigDecimal
位置: 类 Main
            big2 = new BigDecimal(num2);        
                       ^
5 错误


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