FACTORIELLE

import java.math.BigInteger;
//import java.util.*;
import java.io.*;
/**
 * Implante le calcul de la factorielle sur le type BigInteger.
 */
public class nouvfacto
{
  protected static BigInteger[] table = new BigInteger[100];
  static { table[0]=BigInteger.valueOf(1); }
        
  public static synchronized BigInteger facto ( int x)
    throws IllegalArgumentException{
    if(x <0) throw new IllegalArgumentException ( "x doit etre positif");
    for(int size=1; size<= x; size++) {
      table[size] = table[size-1].multiply(BigInteger.valueOf(size));
                        
    }
    return (BigInteger)table[x];
  }
        
  public static void main(String [] argv) {
        
    try {
      for(int i = 1; i <= 50; i++)
	System.out.println(i+"! ="+facto(i));
      try{int c=System.in.read();}
      catch(Exception e){}
    }
 /*   catch(IllegalArgumentException b){
      System.out.println(b.getMessage()); */
    }
  }
}