随机生成一个n bit位的长整数

Import java.util.Scanner;Public class Random {Static long createRandInteger (int n ){   long x;   x=( int ) (Math.random( )*(Math.pow(2,n-1)+Math.pow(2,n-1)));   return x;}Public static void main (String[ ] args){System.out.printIn (“请输入随机数bit位的长度n=”);Scanner s=newScanner (System.in);int n;n=s,nextInt ( );System.out.print ( “该随机数是：”+createRandInteger (n));}}