System.out.println(Integer.toBinaryString(~-5))
public static void main(String[] args) {int a=(int)(Math.random()*2+1)
int aa=(int)(Math.pow(-1, a))
System.out.println(aa)
int aaa=(int)(Math.random()*100+1)
int num=aa*aaa
System.out.println(num)
if(num>0){
System.out.println("正数")
}else if(num<0){
System.out.println("负数")
}else{System.out.println("0")}
}