我需要将值存储到 int 类型的变量中，但 int 还不够？

Question

I had Started a new project for school Called BasesConvertor with Java in android app

So My problem is: - to convert Base 10 To an other bases I need to store the value to variable with int type but int is not enough Max int size is : 2,147,483,647

• and small value of Hexadecimal equal a big value of decimal ex : FFFFFFFFFFFF(16) = 281 474 976 710 655(10)

Answer 1

In this case, 72057594037927702 is too long for int and long . You will have to use BigInteger :

BigInteger i = new BigInteger("72057594037927702");

EDIT:

If you want to use mathematical operations such as addition, subtraction, multiplication, division, etc. you will need to use the predefined methods in the BigInteger class:

BigInteger i = new BigInteger("72057594037927702");
System.out.println(i);
//  Add five
i = i.add(new BigInteger("5"));
System.out.println(i);
// Take tree
i = i.subtract(new BigInteger("3"));
System.out.println(i);
// Four times
i = i.multiply(new BigInteger("5"));
System.out.println(i);
// Divided among 2
i = i.divide(new BigInteger("2"));
System.out.println(i);

/*
 * Output:
 *      72057594037927702
 *      72057594037927707
 *      72057594037927704
 *      360287970189638520
 *      180143985094819260
 */

Answer 2

you can try storing the value in a different data type, say double would do and check out this chart it might help

http://cs-fundamentals.com/java-programming/java-primitive-data-types.php

This chart has all the data types and their limits