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package API;public class BigNum {//如果普通的long和double的精度不足以满足要求，那么可以使用java.math包中的两个类//BigInteger和BigDecimal//前者实现任意精度的整数运算，后者实现任意精度的浮点数运算//BigInteger add(BigInteger other)//BigInteger subtract(BigInteger other)//BigInteger multiply(BigInteger other)//BigInteger divide(BigInteger other)//BigInteger mod(BigInteger other)//BigInteger sqrt()//int compareTo(BigInteger other)//static BigInteger valueOf(long value)//BigDecimal(String digits)//BigDecimal add(BigDecimal other)//BigDecimal subtract(BigDecimal other)//BigDecimal multiply(BigDecimal other)//BigDecimal divide(BigDecimal other)//Bigdecimal divide(BigDecimal other, RoundingMode mode)//int compareTo(BigDecimal other)}