Variable-Precision Numeric Data - JAVA Programming for Engineers - page 245

Table 22-3
Methods in the BigInteger Class (continued)

RETURNS METHOD/ACTION

String toString()

Returns the decimal String representation of this
BigInteger

String toString(int radix)

Returns the String representation of this
BigIntegerin the given radix

Static BigInteger valueOf(long val)

Returns a BigInteger whose value is equal to
that of the specified long

BigInteger xor(BigInteger val)

Returns a BigInteger whose value is (this ^ val)

A sample program
Thefollowingprogramdemonstratesarithmeticonbigintegernumbersby
calculating the factorial. The following is a listing of the source code.

// Filename: BigIFact
// Reference: Chapter 22
// Description:
//

Demonstration of high-precision integer arithmetic

// with the BigInteger class. Program calculates the

// factorial of a big integer number

// Requires:
//

Keyin class in current directory

import java.math.*;
class BigIFact

{

public static void main(String[] args)
{

int v; // Input
BigInteger p = BigInteger.valueOf(1); // Factor

System.out.println("Big integer factorial routine\n");
v = Keyin.inInt("Enter value: ");
// Calculate factorial by iteration
for(inti=1;i<=v;i++)
p = p.multiply(BigInteger.valueOf(i));
// Display result
System.out.println(p);

}

}