求4！

import java.io.*; public class Class1 { public static void main( String args[] ) { Fact N = new Fact( 4 ); System.out.println( N.fact( ) ); } } class Fact { int n ; Fact( int nn ) { n = nn; } int fact( ) { int i , f = 1; for ( i=1; i<=n; i++ ) f = f*i; return f; } }