import java.math.BigInteger;
/** Computes an exact factorial, using a BigInteger.
*
* Taken from Core Web Programming from
* Prentice Hall and Sun Microsystems Press,
* .
* © 2001 Marty Hall and Larry Brown;
* may be freely used or adapted.
*/
public class Factorial {
public static void main(String[] args) {
for(int i=1; i<=256; i*=2) {
System.out.println(i + "!=" + factorial(i));
}
}
public static BigInteger factorial(int n) {
if (n <= 1) {
return(new BigInteger("1"));
} else {
BigInteger bigN = new BigInteger(String.valueOf(n));
return(bigN.multiply(factorial(n - 1)));
}
}
}
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