Java starts from zero 29 (large number operations (Bigintger, BigDecimal)

First, BigInteger

If an integer data exceeds the maximum type length of an integer at the time of the operation, the data cannot be mounted, so the BigInteger class is used at this time. An integer of immutable arbitrary precision. In all operations, BigInteger (such as the basic integer type of Java) are represented in twos complement form. BigInteger provides a counterpart to all Java's basic integer operators and provides all the relevant methods of Java.lang.Math. In addition, BigInteger provides the following operations: modulo arithmetic, GCD calculation, prime number test, prime generation, bit manipulation, and some other operations.

No.	Method	Type	Describe
1	Public BigInteger (String val)	Structure	Converts a string into a BigInteger type of data
2	Public BigInteger Add (BigInteger val)	Ordinary	Addition
3	Public BigInteger Subtract (BigInteger val)	Ordinary	Subtraction
4	Public BigInteger Multiply (BigInteger val)	Ordinary	Multiplication
5	Public BigInteger Divide (BigInteger val)	Ordinary	Division
6	Public BigInteger Max (BigInteger val)	Ordinary	Returns the maximum value in two large numbers
7	Public BigInteger min (BigInteger val)	Ordinary	Returns the minimum value from two large numbers
8	Public biginteger[] Divideandremainder (BigInteger val)	Ordinary	Division operation, the first element of the array is the quotient of the division, the second element is the remainder of the division

Twomanipulating large integers with BigInteger

 PackageCom.pb.demo1;ImportJava.math.BigInteger; Public classBigintegerdemo { Public Static voidMain (string[] args) {BigInteger bi1=NewBigInteger ("123456789"); BigInteger Bi2=NewBigInteger ("987654321"); System.out.println ("Addition operation:" + Bi2.add (BI1));//addition OperationSystem.out.println ("Subtraction operation:" + bi2.subtract (BI1));//Subtraction OperationSystem.out.println ("Multiplication operation:" + bi2.multiply (BI1));//multiplication OperationSYSTEM.OUT.PRINTLN ("Division operation:" + bi2.divide (BI1));//Division OperationSYSTEM.OUT.PRINTLN ("Maximum number:" + Bi2.max (BI1));//Find the maximum numberSystem.out.println ("min:" + bi2.min (BI1));//Find the minimum numberBigInteger result[] = Bi2.divideandremainder (BI1);//Division OperationSystem.out.println ("Quotient is:" + result[0] + "; remainder is:" + result[1]); }}

Results:

Addition operation: 1111111110 subtraction Operation: 864197532 multiplication Operation: 121932631112635269 Division operation:8 Maximum number:987654321 Minimum number:123456789 quotient is:8; remainder is: 9

Third,use BigDecimal to specify the number of reserved digits for decimalsA program that does not require any accurate calculation accuracy can be done directly using a float or double, but if you need to calculate the results accurately, you must use the BigDecimal class.

No.	Method	Type	Describe
1	Public BigDecimal (double val)	Structure	Converts a double representation to BigDecimal
2	Public BigDecimal (int val)	Structure	Converts an int representation to BigDecimal
3	Public BigDecimal (String val)	Structure	Converts a string representation to BigDecimal
4	Public BigDecimal Add (BigDecimal augend)	Ordinary	Addition
5	Public BigDecimal Subtract (BigDecimal subtrahend)	Ordinary	Subtraction
6	Public BigDecimal Multiply (BigDecimal multiplicand)	Ordinary	Multiplication
7	Public BigDecimal Divide (BigDecimal divisor)	Ordinary	Division

Java starts from zero 29 (large number operations (Bigintger, BigDecimal)