29. (问答题)
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;

}

}